Although never deployed to Vietnam, I was in the U.S. Army Military Police from 1974 to 1979. Male line MPs we were of course issued the 1911 from various manufacturers. Female line MPs were issued S&W Model 10 4 inch light barrel revolvers. I guess the Army figured women couldn't handle the 1911. (They never saw my MP ex-wife shoot one!)

Military Police Investigations (M.P.I.) were made up of all military personnel. They were issued both S&W Model 10's and Colt Detective Specials with 2 inch barrels.

Army Criminal Investigations Division (C.I.D.) made up of military and civilian personnel, were also issued S&W and Colt 2 inch revolvers.