The grunts?
Term of endearment for 11B's (eleven B's) Infantrymen. Also known as Grunts, Ground Pounders during Vietnam. It's an affectionate name which is proudly monikered even for todays Infantrymen. The Infantry is known as the Queen of Battle. That's good thing. the Queen is the most versatille piece on the chess board and the Infantry is the most versatile force on the battlefield.
Artilleymen, 13B's are know as Redlegs, muzzle maggots, cannon cocker's. Field Artillery is known as the King of Battle. The term means that Field Artillery is capable of mass destruction on the battle field.
Armor & Armored Calvary 19E's are known as Tankers.