Gatofeo:
Did USAF OSI agents have a "standard" issue weapon back then ? I seem to remember accounts of special chopped down .45 1911's specially made for them by the gunsmiths at Lackland. On another occassion, I recall reviewing the course of fire for an OSI group about to qualify and it mentioned using their S&W model 36's five shooters. Not doubting your experience with the 2" bbl model 15's, but I'm wondering if OSI had a bunch of handguns to choose from.