I have a photo of my father wearing one of those rigs. It is correct that they were for military police use and they continued in use at least until well after I left the army in 1968. A full set consisted of a garrison belt with a single prong buckle, a magazine pouch for two magazines and a pouch for a first aid dressing. I do not recall if the first aid dressing pouch had hooks that required another piece or not. Those I saw in the regular army were patent leather, while those I saw when I was in the D.C. National Guard, in an MP battalion, were plain black leather. Before the army switched back to black in the late 1950s, they were in brown, tan or russet. It would be difficult to say what was the official color because of the age of the originals that were not manufactured in black but the only one I ever owned was decidedly russet in color.

Although my father was wearing one of those in a photo, he was not an MP and moreover, he was wearing a revolver in a reverse draw holster, probably a .45 revolver. There was no sort of ammunition pouch or first aid pouch visible in the photo. He was wearing the regular OD service coat (not an Ike jacket) but without collar brass. In fact, he is wearing no collar brass in any photo I have of him in uniform.