An M7 holster like that one has carried mine a lot of miles, starting with gasoline powered M48A2C tanks, through all the M60 series, Sheridans and finally, the early versions of M1 Abrams.

Even after I had to give up the tank for a jeep as First Sergeant, I preferred the shoulder holster as I could put that on before all the LBE. It may not have been stylish, but it was practical.