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The 1st Aerospace Surviellance and Control Squadron, a unit of the USAF Air Defense Command, was activated on 6 February 1961, organized on 14 February 1961[1], and became operational on 1 July 1961[2] as the Spacetrack component of NORAD SPADATS. It was the operational version of research and development Project Space Track. The Squadron name was changed to 1st Aerospace Control Squadron on 1 July 1962, but it was still informally called just 1st Aero. The unit was inactivated on 21 April 1976. 1st Aero was assigned to the 9th Aerospace Defense Division when that was activated on 14 July 1961.

Until April 1966, when operations were moved to the NORAD Cheyenne Mountain Complex, 1st Aero was located on the bottom two floors of Ent AFB building P4 Annex, a former hospital building, adjacent to the NORAD command center.

The mission is now performed by the 614th Air & Space Operations Center, part of the Joint Space Operations Center at Vandenberg AFB, California.

Mission

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1st Aero was responsible for tracking all artificial earth satellites, space probes, carrier rockets, and debris, US and foreign.

Awards

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Supporting unit, 4608th Support Squadron, ADC, 1 February 1960 - 30 April 1962[3]

Air Force Outstanding Unit Award, 1 June 1961 - 15 September 1963[1]

Outstanding Air Defense Unit of the Air Defense Command, Air Force Association, September 1963[4]

Air Force Outstanding Unit Award, 1 July 1973 - 30 June 1974[1]

Official Emblem

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The 1st Aero emblem was approved on 6 February 1962.

Official 1st Aero Emblem

Description

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On an Air Force blue rectangular area a stylized computer above a semicircular geometrical pattern all surmounted by a stylized satellite, its four antennae saltirewise, all Air Force golden yellow; the satellite charged with an Air Force blue star; issuing from dexter chief a portion of the sun in splendor, and in sinister chief a formation of stars, Air Force golden yellow.

Motto

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On an Air Force golden yellow scroll, edged and inscribed Air Force blue, PRIMARII AETHERIS DEFENSORES, Space Defenders of the First Rank.

Significance

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The emblem is symbolic of the squadron and its mission. Against a background resembling in shape the fan-like radar of the Ballistic Missile Early Warning System, deep blue in color to represent the sky, and supplemented with the sun and stars to indicate day and night operations, a stylized satellite of the Vanguard class symbolizes the squadron as the Vanguard of Aerospace Defense. The satellite surmounts two symbols representing a computer for analyses and computations and a detection system with the capability of the MIDAS system and world-wide sensors. The solitary star on the satellite indicates that this is the first organization of this type.

Unofficial Emblem

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In 1961, 1st Aero had a competition to select the squadron emblem, with ideas to be posted on the bulletin board. One anonymous suggestion, surreptitiously posted in the middle of the night, proved so popular that Colonel Miller, the Squadron Commander, had copies made for all squadron members and other people who supported the squadron.

Unofficial 1st Aero Emblem

Here is the text posted with the submission:

Blazoning (Symbology)

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Central in our noble emblem is a crystal ball, rampant on a field of confusion, depicted floating in a sea of coffee.

The yellow streak, or batton sinister (heraldic mark of illegitimation, commonly called the bastards' barr) maintains balance between the traditional ADC Azure (Shade 84)[the official color of USAF uniforms] and NORAD purpure [NORAD was sometimes considered purple, the staff being a combination of Army red and Air Force and Navy blue]. Unfortunately, this line of demarcation is not quite long enough to keep things from getting confused. [This is a reference to the ongoing tension between NORAD and ADC, at times even involving CINCNORAD General Lawrence S. Kuter, and the ADC Commander, Lt Gen Robert M. Lee; both sometimes appeared distinctly unfriendly.]

Emblazoned, dexter chief and sinister base, are the symbols of the accuracy within which we attempt to maintain our orbital ephemerides [plus and minus infinity].

Beneath the shield, the heroic name of our noble organization will be forever proclaimed on a roll of six-ply carbon paper.

The crest, above the shield, is a crying towel, presented with the compliments of the 496L SPO [the SPO responsible for the development of Project Space Track]. It is supported by two wings, depicting the hopeful thought that, if things get too tough, you can always go fly.

Sensors

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1st Aero had essentially the same set of sensors used by Project Space Track, described in detail in that article, with the addition of a phased array radar at Eglin AFB, Florida, and two additional Baker-Nunn cameras, one of which was used by the Royal Canadian Air Force at Cold Lake, Alberta, Canada.

Orbital Computations

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1st Aero used the methods of orbital prediction developed by Dr. Eberhart W. Wahl at Project Space Track in 1957, which computed ephemerides based on standard Keplerian orbits. This excellent technique became less and less useful as a satellite got lower into the atmosphere, encountering drag, which made it difficult to forecast the ephemeris of the satellite accurately. Because of this, in 1959, Lt Cotter at Space Track had the questionable pleasure of being the first person to lose track of an artificial earth satellite, Explorer IV, for which he was the orbital analyst. The Smithsonian Astrophysical Observatory lost it a day or two later and only Mr. Arthur S. Leonard, of the Sacramento Moonwatch Team, was able to continue tracking somewhat longer, using his own special observational methods[5]: 3 .

By 1962,the situation was somewhat better. The Soviet satellite Sputnik 4 was slowly entering lower orbits because of the atmospheric drag. Using a new program, Satellite General Perturbations Differential Corrections (SGPDC), and observations from the Shemya radar, 2d Lt Vander Stucken, the orbital analyst for the decay, plotted the changing orbital period and was able to predict the exact revolution on which the satellite reentered. A 20-pound piece of it landed on a street in downtown Manitowoc, Wisconsin on the western shore of Lake Michigan.

To make progress in automating ephemeris forecasts, Aeronutronic and TRW developed sophisticated new programs. 1st Aero orbital analysts evaluated the two programs:

Lt Vander Stucken (now 1st Lt) studied the Aeronutronic submission, Spiral Decay, designed by Geoff Hilton and programmed and validated by Patricia Crossin. Dr. Louis G. Walters was the Manager and Systems Engineer. Spiral Decay was funded to support the USAF space program, which had been experiencing trouble with satellites, such as incorrect orientation at propulsion events, some of which reentered carrying sensitive equipment. It was desired to know more accurately where the reentry would occur in case salvage was possible.[6]

Captains Craig and Strub and Lt Clark worked with Aeronutronic on the project. Detailed astrodynamics reports of this and other Aeronutronic support of Project Space Track and 1st Aero are on file at the offices of Lockheed Martin (formerly Loral Corporation) in Colorado Springs, Colorado. An index of the reports is at the National Museum of the Air Force[7].

Lt Clark studied the TRW submission, Electronic Systems Precision Orbit Determination (ESPOD). ESPOD had been developed for Program 437 to enable computation of trajectories for satellite intercept.

As a demonstration of the effectiveness of Spiral Decay, the program was used to forecast the reentry of Soviet Cosmos 23 (1963-050A) on Good Friday 1964. Public media had been alerted to the impending decay and many people in Canada saw the fiery reentry. One racetrack even dimmed the lights to enhance the show.

Spiral Decay was considered a more sophisticated program than ESPOD and it used much less computer time to attain more accurate results. It was selected as the 1st Aero standard for analysis, significantly helping predict future decay trajectories. It was also adopted as the primary computer capability for weapon engagement and was very useful in more precisely locating sensors, such at the radar at Diyarbakır, Turkey[6].

Another major progress was increasing automation of the correlation of observations with known satellites.

Some problems that developed required effort by 1st Aero personnel to overcome: for example, contractors' software sometimes used different values for important matchematical constants, making the orbital computation results different, depending on whicn program was used. 1st Lt Rodney M. Larson played an important role in these efforts.

1st Aero orbital elements, along with those computed by the Smithsonian Astrophysical Observatory and the NASA Goddard Space Flight Center, were included in the Satellite Situation Reports regularly published by Goddard.

In 1963 and 1964, Dr. Wackernagel presented two short courses in celestial mechanics to officers newly assigned to 1st Aero. These assignments replaced some of the original squadron complement who were being reassigned or left the service[8]

Operations

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In April 1961 a Philco 2000 computer had been installed in Building P4 Annex at Ent AFB for dedicated 1st Aero use. The Phlco 2000 was considered the fastest computer in the world at the time of installation[9]: 1 . 1st Aero still used IBM punch cards for data, as did Project Space Track. The Philco 2000 was infamous for devouring the cards. The computer was programmed using FORTRAN for batch processing and the TAC assembly language for other work[10].

Project Space Track at Laurence G. Hanscom Field MA was the backup facility for 1st Aero operations. About 49 hours before 1st Aero became operational, the Navy's Transit 4A carrier rocket exploded. Orbital analysts at 1st Aero and at the Hanscom backup achieved a landmark in satellite tracking by identifying 296 of the fragments. Details of this event and the subsequent development of tools for analysis of breakups are at Project Space Track.

From 25 March to 6 April 1962, the 1st Aero orbital computations were transferred to Project Space Track while the Ent AFB computer was being modified.

In mid-1962, the NORAD DCS/Intelligence (J-2) expressed his appreciation to 1st Aero for the information and expert technical assistance provided in support of NORAD analysis of the Soviet VOSTOK III and VOSTOK IV operations[11].

In early November 1963, 1st Lt Phillips R. Granberry was the orbital analyst for a new Soviet launch, which had occurred on 1 November. In plotting the observations made by the BMEWS radar at Flylingdales Moor, England, and other sensors he noticed that the data showed an apparent change in the satellite's orbital period. Puzzled, he showed his data to Capt Frederick C. Eaton, who realized that the Soviets had boosted the satellite, changing the orbit. The two officers alerted the NORAD Space Intelligence Division, which passed the information to the intelligence community, where it was received with much interest. This confirmed a boast by Soviet Premier Khruschev that the Russians had a maneuverable satellite, something that had been treated with some disbelief[12].

It is now known that the satellite, called Polyot, was in fact a prototype orbital carrier rocket for an antisatellite system. Only one other Polyot was launched (in April 1964); the system never became operational.

1st Aero personnel supported the NORAD exhibit in the United States Pavilion at the New York World's Fair in 1964[13].

Operational Details

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1st Aero operations were based on the techniques developed at Project Space Track. By 1962[14], initial observations were processed by the Report Association Program (RASSN) which ran automatically twice a day plus twice for BMEWS data. The program associated observations with known orbits. The output of the program, plus data from the Checker Program (SRCHEK), was sent to the Duty Space Surveillance Officer and Technician (DSSO/DSST) for review with some assistance from the Duty Orbital Analyst (DOA) as needed.

After the daily RASSN runs had been checked, one element correction run was made using the Satellite General Perturbations Differential Corrections (SGPDC) program. This automation was a definite improvement on the manual data plotting done at Project Space Track in 1960[15]. In those days, the DOA would plot data points showing the difference in the time the satellite crossed the equator versus the current ephemeris prediction (on the ordinate) against the time of observation (on the abscissa). He would manually sketch a line as a best estimate of the fit to the data and choose a few points on either side of the line. He then filled out a form with these data points. The form was used to input the data at the IBM 709 computer (earlier the IBM 610), which ran a least squares fit and produced improved orbital elements.

None of this manual procedure was normally necessary by 1962 and the DSSO was able to handle the operation and produce the necessary Bulletin and Look Angles, which sent ephemerides to sensors and other interested parties (bulletin and look angle details at Project Space Track). Information from the latest Bulletins for unclassified satellites (now over 200) was posted on the Satellite Situation Board in the DSSO/DSST area.

About 600 to 800 observations remained unassociated daily. The unassociated observations were passed to the DOA for consideration. Many of these observations in 1962 were of the several hundred pieces from the explosion of the carrier rocket of 1961 Omicron in June 1961, not all yet in known orbits.

If the DOA thought the uncorrelated observations were from pieces associated with a known satellite, he could run the REDUCTION program with the elements of the known satellite and plot the resulting information to distinguish the remaining pieces. So manual plotting was still an important operation for the DOA.

Other special DOA activity occurred when a satellite neared decay. When the orbital period fell below 90 minutes, the DSSO notified the DOA and a special analyst was normally assigned to monitor the decay. In the unusual case of the decay of a Discoverer recovery vehicle that had not come down where programmed, the DOA had access to a special computer program, GRNTRK, which provided a sub-satellite trace for one revolution, to assist in specifying the track.

New friendly launches were handled by a DOA dedicated to the task but, in the case of new Soviet launches, an Analyst for Intelligence was assigned. There were two of these in 1962 (Lt Eric B. Nelson and Lt Gordon E. Markham).

Analysis of interplanetary and lunar probe launches were handled by Special Project Analysts, who had several special astrodynamic programs to assist in computations. The Encke program (MUNENDC) was used when the vehicle was within 125 earth radii and the Interplanetary program (IPPD), adjusting for planetary perturbations, for vehicles beyond that distance. The Special Project Analysts also handled special requests for such things as very accurate orbital elements or decay information for a satellite (as might be required by research or educational groups). These analysts also monitored incoming technical papers, attended technical meetings to obtain information which was of use to the mission, and monitored improvements in decay forecasts. One Special Project Analyst was Capt W.F. Craig III.

Personnel

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Squadron Commanders

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Lt Col John E. Ciccolella was the first [Acting] Commander, serving until the arrival of Col Robert Miller, of Albion, Illinois, former Commander of the 94th Fighter Interceptor Squadron, on 27 March 1961[1]. Colonel Miller retired in August 1965. He was succeeded by Col Roscoe C. Crawford, Jr. (Sep 1965 - Jul 1966), then Col William R. Adams (including Jan - Mar 1967), Col William C. Watts (including Jan 1968 - Jun 1970), Col. Bernard J. Szczutkoski, Jr. (including Jan 1973 - Mar 1973), Col. Thomas C. Brandt (including Apr 1973 - Sep 1975). There are no records for the missing dates[16]

Initial Squadron Cadre[17][18]

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Lt Col Willliam H. Gibson (primary duty Director, SPADATS[19])

Lt Col Dalton F. Newton (primary duty Chief, SPADATS Operations Division, also Director, Spacetrack Center and later Director, SPADATS)[20][21]

Maj James L. Rynning (Administrative Officer[22])

Capt William P. Bingham (primary duty Space Surveillance Officer [19])

Capt Frederick Carl Eaton

Capt Orville L. Greynolds

Capt James W. Head

Capt Billy M. Jackson

Capt Thomas C. Marsters (primary duty Chief, SPADATS Control Center[19])

Capt Donald D. McComb

1st Lt Eric B. Nelson (primary duty Analyst for Intelligence[19], the first officer in that duty assignment) As such, Lt Nelson was responsible for computing the orbits of all new Soviet launches and for liaison with the Space Intelligence Division, NORAD J-2, located on the top two floors of the same building.

SMSgt Harold E. Barton

Other Personnel (1961-1964)

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No complete roster of 1st Aero personnel exists; DSSO = Duty Space Surveillance Officer (AFSC 2035A), DSST = Duty Space Surveillance Technician (AFSC 2035S), DOA = Duty Orbital Analyst (AFSC 2025A), DSOIA = Duty Space Object Identification Analyst (AFSC 2025B).

Lt Col(?) Forrest Betzer[23] Lt Col Bissell (Deputy Commander?)[24] Maj George S. Allen[25] Maj George F. Bergstrom[25] Maj Tommy Cobb[25]
Maj William E. Doud[26] Maj Henry G. Gendreizig[26] Maj Archibald G. Kearns[25] Maj Glenn Perryman[25] Maj Victor R. Wakefield[25]
Capt T. W. C. Birge[13] Capt Kenneth L. Claassen[26] Capt W. F. Craig III[11] Capt John C. Crocker[25] Capt Charlie Coon (DSSO)[24]
Capt Robert L. Davis[25] Capt Frank J. Gingrich, Jr.[13] Capt David D. Igelman[25] Capt Les[lie] H. Minear (second tour, 1971-

1974; Sq Operations Officer)[13][27]

Capt George Nosal, Jr.[25]
Capt William M. Porter, Jr.[26] Capt Robert E. Rocque[25] Capt Herbert L. Roos[25] Capt George P. Textor[25] Capt Edwin S. Warrell[25]
1st Lt Dennis L. Butler[26] (served four separate tours in 1st Aero, 1 July 1961 to Squadron deactivation on 21 April 1976[28]) 1st Lt John B. Clark 1st Lt Lawrence R. Cotter[29] (primary duty SPADATS Staff Officer[30]) 1st Lt Rodney M. Larson[25] 2d Lt Stephen M. Ballanco[25]
2d Lt Bruce Burns 2d Lt Albert G. Cox (primary duty Orbit Analyst[20]) 2d Lt Charles W. Davis[25] 2d Lt Phillips R. Granberry[31] 2d Lt Gordon E. Markham[25]
2d Lt James L. Parrish[25] Lt Juan Rivero 2d Lt George L. Roeder[25] 2d Lt Leonard G. Tatum[25] 2d Lt Richard W. Vander Stucken[25]
MSgt A. H. Boisselle, Jr.[13] MSgt A. J. DeHaven[13] MSgt John Friel[23] MSgt Ken[neth?] Heiser[23](DSST)[24] MSgt John Sheehan[23]
TSgt W. R. Buller [13] TSgt Donald A. Dragon[13] TSgt John Hernandez[23] TSgt D. C. Hux[13] TSgt W. H. Smothers, Jr.[13]
SSgt Harvey Buzzell[23] SSgt Carl V. Heberling[23]

Celestial Mechanics Course Students[32]

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All Orbital Analysts; some later became Space Surveilllance Officers

Class of 1963
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1st Lt John B. Clark 2d Lt Robert W. Cox[25] 1st Lt Tom Mills 1st Lt Ivan Thomas Lt Watkins
Class of 1964
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2d Lt Marcus Cabrera 2d Lt Joel DuBois 2d Lt James Ferguson 2d Lt Peter Frolick 2d Lt Tomas Lange
2d Lt Terry D. Miller

Later officer personnel (1968-1972)[33]

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Maj Robert W. Lacy (Senior Director,

later Chief, Training Office)

Capt Andy Ballas (DOA and DSOIA) Capt Bill Brown, Jr. (DOA) Capt Dick A. Cable (DOA) Capt Tom Mills (DOA)
Capt Daniel O. Schwartz (DOA)* Capt Len Tatum (DOA) 1st Lt Bill Barker (DOA) 1st Lt Sue Breeden (DOA) lst Lt Walt Frankhauser (DOA)
1st Lt Bruce Garman (DOA) 1st Lt Rollie Jastaad (DOA) 1st Lt Dick Katz (DOA) 1st Lt Jim Lewis (DOA) 1st Lt Bob Morris (DOA)
1st Lt Ron Mosely (DOA) 1st Lt Larry Narcus (DOA)
  • later 1st Aero training officer and then Space Defense Center Senior Director

Contractors

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The Philco representative was Carl J. Stotz.

Barry Rosenberg, Wolf Corporation, was at Ent AFB, 1961-1963, to help insure that the computer programs from the SpaceTrack IBM 7090 worked properly on the Philco 2000. In 1963, he returned to Hanscom Field, 496L ESSPO, as a Wolf Corporation consultant doing the same work.

Aeronutronic, Dr. Louis G. Walters, Charles Geoffrey "Geoff" Hilton, Patricia Crossin.

System Development Corporation, Jack Stanfield, Roy Schaub, Mary E. Ferguson, H. Adelman.

TRW, Dr. David Morrison.

Professor Leland E. Cunningham from the Department of Astronomy, University of California, Berkeley, came to Ent AFB as a consultant to analyse the accuracy of the Philco 2000 computations. Professor Cunningham was an expert on the orbits of comets, on numerical analysis, and on the accuracy of computer computations.

Other Support

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Several people from Project Space Track at Hanscom Field came to Ent AFB to assist activation of 1st Aero. Among these were Dr. Eberhart W. Wahl, 1st Lt Algimantas Šimoliūnas, 1st Lt Lawrence R. Cotter (who arrived at Ent AFB 20 March 1961 to coordinate 496L SPO participation in the activation of the SPADATS Control Center[34] and was later assigned to 1st Aero), 1st Lt Jack A. Frohbieter, Robert Chabot, Lawrence Cuthbert, and Harold Lyons.

9th Aerospace Defence Division and Air Defense Command:

Dr. Hans Beat Wackernagel moved to Colorado Springs from Project Space Track as an astronomer in the 9th Aersopace Defense Division, the parent organization of 1st Aero. From 1979, he was a Physicist at HQ NORAD. Dr. Wackernagel, who retired in 1990, spent his working life analyzing Spacetrack operations. As he said "When we find a problem, we suggest ways to solve it."[35]. He was known in part for development of the geopotential Space Track Earth Model (SPEM) and his interest in converting all surveillance systems to the metric system, which had been used for orbital computations since 1957. With Charles Geoffrey Hilton of Aeronutronic, he co-authored "Mathematical Foundation for SCC Astrodynamic Theory," a treatise called TP8, which is till in use[10]. [SCC was the Space Computational Center, a follow-on to 1st Aero.]

Captains James Strub and Brad Wilde also supported 1st Aero.

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9th Aerospace Defense Division lineage

References

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Except as noted, all documents referenced are in the archives of the National Museum of the United States Air Force, Wright-Patterson AFB, Ohio. For JPEG copies of the references, see the Talk Page.

  1. ^ a b c d AFSPC/HO. Memorandum, "1st Aerospace Control Squadron". Ent AFB CO: 30 October 2006
  2. ^ Miller, [Robert]. Signed draft AF Form 77a. [Ent AFB CO]: 31 August 1961
  3. ^ Miller, Robert. 1 Aerospace Control Squadron (ADC) letter to Capt Eric B. Nelson. Ent AFB CO: 23 August 1963
  4. ^ Miller, Robert. 1 Aerospace Control Squadron (ADC) letter to Capt Eric B. Nelson. Ent AFB CO: 14 August 1963
  5. ^ Cotter, Lawrence R.. Reminiscences About Space Track History. Privately published. [Berkeley CA]: 20 November 2006.
  6. ^ a b Walters, Dr. Louis G.. Historical Perspective, Ford/Philco/Loral Aerospace Astrodynamics Role in Space Command Evolution. Zephyr Cove NV: 15 August 1993 in Mansfield, Roger L. et al.(q.v.)
  7. ^ [Mansfield, Roger L. et al.]. Index/History for the Aeronutronic Astrodynamics Collection. Loral Corporation. Colorado Springs CO: September 1993
  8. ^ Miller, Terry D.: E-mail communication. [Colorado Springs CO]: 7 November 2010
  9. ^ Philco Western Region Public Relations Office. "'Asynchronous' Design Concept Permits Heretofore Unobtained Computer Speeds." Philco News Release (S-6). Palo Alto CA: 7 July 1961
  10. ^ a b Mansfield, Roger L.. NOTES ON NORAD'S DELTA SYSTEM, THE SCC, AND SPADOC. [Colorado Springs CO]: 5 November 2010
  11. ^ a b Hull, Harris B. Headquarters North American Air Defense Command. Letter of Appreciation to Commander, USAF Air Defence Command. Ent AFB CO: 29 August 1962
  12. ^ Donaldson, E.M.. "Russian Satellite Seen to Change Orbit," Daily Telegrqph. London: 28 November 1963
  13. ^ a b c d e f g h i j Newton, Dorr E., Jr.. Memorandum for All Personnel Assigned to NORAD Exhibit. North American Air Defense Command. Ent AFB CO: [May? 1964]
  14. ^ Ferguson, Mary E. TASK SPECIFICATIONS OF THE SPADATS DUTY ORBITAL ANALYST (DOA). Field Note FN=CN-101/000/00. System Development Corporation. Santa Monica CA: 17 September 1962
  15. ^ Fitzpatrick, F.M. And Findley, G.B.: The Tracking Operation at the National Space Surveillance Control Center (NSSCC), Eglin AFB, FL: 2 September 1960.
  16. ^ Lauria, Thomas: Information after Jul 1966 contained in official e-mail communication from the USAF History office. Maxwell AFB AL: 29 November 2010
  17. ^ Headquarters Air Defense Command Special Orders Number AAH-56. Ent AFB CO: 6 March 1961
  18. ^ Headquarters 4600th Air Base Wing (ADC) and Ent Air Force Base Special Orders Number P-216. Ent AFB CO: 13 April 1961
  19. ^ a b c d Headquarters 4600th Air Base Wing (ADC) and Ent Air Force Base Special Orders Number P-379. Ent AFB CO: 6 June 1961
  20. ^ a b Headquarters 4600th Air Base Wing (ADC) and Ent Air Force Base Special Orders Number P-7. Ent AFB CO: 19 February 1962
  21. ^ NORAD 1OOP-S. AF Form 626. Travel Orders. [Ent AFB CO]: 26 June 1962
  22. ^ 1st Aerospace Surveillance and Control Squadron. AF Form 626. Travel Orders. [Ent AFB CO]: 20 April 1962
  23. ^ a b c d e f g Shown on contemporary photo; identified by former 1st Aero personnel, Oct-Nov 2010
  24. ^ a b c Gingrich, Frank J., Jr.: E-mail correspondence. [Woodbridge VA]: 31 October 2010
  25. ^ a b c d e f g h i j k l m n o p q r s t u v w Headquarters 4600th Air Base Wing (ADC) and Ent Air Force Base Special Orders Number P-63. Ent AFB CO: 15 February 1963
  26. ^ a b c d e HQ Air Defense Command, Special Orders Number M-153. Ent AFB CO: 11 July 1961
  27. ^ Minera, Leslie H.: e-mail 7 November 2010
  28. ^ Butler, Dennis L.: Telephone conversation, 27 November 2010
  29. ^ HQ Air Defense Command, Special Orders Number A-242. Ent AFB CO: 7 September 1961
  30. ^ Headquarters 4600th Air Base Wing (ADC) and Ent Air Force Base Special Orders Number P-575. Ent AFB CO: 18 September 1961
  31. ^ Headquarters 4600th Air Base Wing (ADC) and Ent Air Force Base Special Orders Number P-63. Ent AFB CO: 15 February 1963, name incorrectly shown as Phillip R. Granberry
  32. ^ Miller, Terry D.: Partial list of celestial mechanics course attendees. E-mail correspondence. [Colorado Springs CO]: 7, 25 November 2010
  33. ^ Schwartz, Daniel O.: E-mail communications. [Highlands Ranch CO]: 8 November 2010
  34. ^ AFCCDD, NSSCC (Space Track). AF Form 626. Travel Orders. [Hanscom Field MA]: 24 February 1961
  35. ^ Walter Publishing Company. "Dr. Wackernagel dedicates his life to space." The Cheyenne Edition. Colorado Springs CO: 10 March 1989


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