 As many as eight 40th crews could be in the region at one time taking part in combat actions including the sieges of An Lộc and Phnom Penh, and Operations Easter Bunny and Constant Guard.The squadron received no official recognition for its involvement in the Vietnam War because many of its action in the war came after the United States officially ended its participation.At the end of 1974, the 40th pulled its crews out of Southeast Asia, and turned over its responsibility for the adverse weather airdrop mission to the Thai Air Force and Bird Air-a regional civilian contract service flying C-130s.