In the affected articles (see list below), I act specifically as a Board member of NMA, seeking primarily to ensure that there is no incorrect or misleading information about the organization or its projects on the page.
Any major edits I make to that end will also be accompanied by a comment from me on the article's talk page. The comment will explain my rationale for changing the information on the page, and provide necessary information (that may not belong within the article proper) for other editors to repair any appearance of non-neutrality.
I may also make minor edits, such as copy editing or minor informational corrections (mis-typed dates, misspellings, etc). Those I'll note the reason for in the edit comment, and try to remember to check the "minor edit" checkbox :)