Nine U.S. Air Force officers, identified as (among others) Capt Roy H. Boone, Capt Richard Skeels, Maj Spaeth, and LtCol James R. Hildreth, pose before a Douglas A-1 Skyraider as members of training class 67-06, call sign 'Express 33.' Classes like this at Hurlburt Field, Florida prepared A-1 pilots for combat duty in Vietnam during the late 1960s. Project: 218839