As a photographer in S.E. Asia we had the choice of carrying a beat to sxxt 1911-A1 with pitted barrel or an M-16. Since we had to carry 1,000 ft of film and a camera that worked better as a boat anchor we ussually picked the .45. The combat types were thrilled when a doofus photographer showed up with a pistol, finally traded for an M-79 and increased my popularity with the real troopies. While there for 22 months I saw exactly 3 handguns that weren't 1911-A1s. One older sergeant either mech cav, or infantry carrying a Colt 1917, some not a regular army type carrying a Hi-Power and an ARVN probably Major, can't remember the Vietnamese word (tui ta?) carrying a P-38.
I guess I'd pick a nonbeat to sxxt 1911or the Hi-Power, but Im an old guy.