The official sidearm .45 was the 1911A1. There were probably a few old examples of the 1911 still in issue at the time, too.
A lot of air crew carried .38 Special revolvers, ostensibly because they could use tracer ammo for signaling. All I ever saw were S&W, the M&P, model 10 and also the model 15 Combat Masterpiece.
There were also a number of special purpose, special issue handguns in use, but I don't think of any others in caliber .45.
Best,
RR
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[This message has been edited by Rocky Road (edited July 21, 2000).]