M1 Carbine wasn't used in front line battle?

[BrianQ]

The idea was to provide those behind the lines (like cooks, supply clerks, and truck drivers) with something with greater range than the pistol, but not as cumbersome as a heavy M1 Garand battlefield rifle.

100% Internet myth. The idea for what became the M1 Carbine was to fill the gap between the side arm and main battle rifle for the Infantryman whose primary function was other than being a rifleman.