Thompson on a tank

[ebeeby]

[Countryboy77]

My buddy that still drives tanks for tge reserves think it was probly a tracer device and mag was probly loaded with tracers,but I'm sure it could keepsomone from shoving wedges in tge muzzel

Edited January 26, 2023 by Countryboy77

[rpbcps]

I saw this picture before, together with one below, maybe on a previous post on this forum?

This is the note I also have on file with the photos:

"Subcalibre firing was used by the U.S. Army to develop a tank gunner's accuracy, speed, and confidence without the costs and disturbance of firing the main armament. In general, the coaxial machine gun was used for the subcalibre training. 
However, for fire adjustment training, a standard submachine gun was mounted outside the tank. Until a standard mount could be developed, the Tank Gunnery manual recommended the following mount for the 75-mm gun on the M4. For firing, the submachine gun was connected to the firing solenoid from the coaxial machine gun". 
Source: Tank Gunnery, War Department Field Manual FM 17-12, July 10, 1944.
 

Edited January 26, 2023 by rpbcps
Corrected spelling mistake, I get worse as I get older...