My dad was not a front infantryman, but slightly behind with an 81mm mortar crew in the Phillipines. He was trained on a P17 Enfield in basic, given an M1 carbine along with his 40lb mortar baseplate (or rounds of 81mm ammo, depending on the day), but did not have faith in the carbine, so quickly acquired an M1 Garand (from a soldier that was not needing it anymore) and carried it for about 2 1/2 years in the jungles. He only used it once with direct results, at fairly close range, on a Japanese soldier who was pretending to be dead, in a row of dead Japanese along a road. My dad was almost taken by surprise, but the 8 rounds of the Garand allowed him to shoot from the hip, walking the rounds on to the guy at about 15-20 yards. I'm sure he fired it at the enemy many times in other circumstances, but this close range time was the only time he was "face to face". They DID see the carnage that their 81mm mortars delivered as they advanced, so the number of "kills" was never a topic.