This is my Rifle, This is my Gun

This is my Rifle, this is my Gun is an achievement in Halo 4. It is awarded when the player carries a UNSC weapon all the way through the third campaign level, Forerunner, on Heroic or harder. The achievement is worth 20 Gamerpoints. It is represented by an MA5D Assault Rifle.

Trivia
The name of the achievement is a reference to the military chant which states "This is my rifle, this is my gun; this is for fighting, this is for fun," with each mention of the "gun" accompanied by a crotch grab. The chant is notably featured in the film Full Metal Jacket.