Good Day All,
The May, 2023 edition of American Rifleman (published by the US NRA), has a 4 page article by Bruce Canfield, The V-B Rifle Grenade Launcher in World War II. It provides a broad overview of the use, mostly USMC, of the "V-B Rifle Grenade, Mark I" and launchers , predominately 1903, in the years (i.e. 42-43) following US entry into WW2.
Regards,
Michael