carried a blued S&W model 19 in Viet Nam, 1968, 1969, 1970. He'd called his dad back in the States soon after he was deployed to the Riverine Forces, complaing of the lack of good handguns. My uncle asked him what he wanted & Randy told him a S&W mod 19 6" would do just fine.

The next day one was purchased & with the permission of his CO, sent to him there. He carried it throught his tours overseas.
I'm sure he had a rigger or someone make him up a holster.
da gimp