(U.S. Air Force Photograph.) black-and-white photos F-13 Photo Recon Superfortress on Guam December 4, 2018by Lone_Sentry_Admin1 min read Mechanics perform maintenance work on a Boeing B-29 Superfortress, converted to an F-13 photographic reconnaissance variant, on Guam in the Mariana Islands. (U.S. Air Force Photograph.) (U.S. Air Force Photograph.)