"Coming In On A Wing And A Prayer", even covered by Joseph Spence
and Ry Cooder

"Ship In The Sky"- Woody Guthrie, Cisco Houston

"Up In The Air, The Junior Birdmen" (Which Robin Williamson & His Merry Band would cover in live shows for fun)

"Heaveanly Aeroplane"-covered by The Watersons on "Sound, Sound, Your Instruments of Joy"

Oscar Brand's Electra US service songs, with one for each branch, has been reissued bu Collector's Choice as "Four Albums Of Military Song". He also put out a second Air Force LP in 1960, called "Out Of the Blue-More Air Force Songs", as well as a comedy album called "Up In The Air-Songs For Madcap Airmen" and a 2001 CD update of Air Force songs called "The Wild Blue Over Vietnam". All available through
http://www.oscarbrand.com

"In Country-Folksongs Of Americans In The Vietnam War" (Flying Fish 70552) has more from that era.