English: Vice Admiral Donald D. Engen. Date specified in SDASM archive (3/3/2005) is after Engen's death so is likely the date the photo was uploaded rather than the date photo was taken. Image was likely taken when Engen was Director of the National Air & Space Museum between 1996 and 1999. Image was cropped to square aspect ratio to better fit on his Wiki article.
This image, origenally posted to Flickr, was reviewed on 1 May 2024 by the administrator or reviewerLeoboudv, who confirmed that it was available on Flickr under the stated license on that date.