Photo was first published in the Green Bay Press-Gazette in 1974. The Press-Gazette did not provide any copyright notices on it's paper in 1974. See the masthead on Page 1 and the general newspaper info section from the paper the photo was taken from. Thus the photo is in the public domain, eligible under the {{PD-US-no notice}} provided below.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.