Gentlemen, (and ladies),
I don't know what a tanker" M1 is. As one of five tank crewman I was instructed to "bail out" carrying my pistol and one of the following: M2 carbine, M3 "Greasegun" or 30 cal Browning Machinegun with ground mount tripod. These were all part of a basic load for a tank. I do confess that I cheated and stored a full size M1 Garand behind the radio rack with a bandoleer or 10 eight round clips with it. I think there are times when you need to reach out and touch someone. But tanker M1's, no way jay!