How do soldiers carry their rifles?

Answer 1

There are a number of ways soldiers carry weapons. In Drill and Ceremony, there are several commands, but weapons are typically carried at Sling Arms, that is the weapon sling is hung over the right shoulder with the barrel pointing skyward.

While halted, at attention the order Port Arms may be called. In this position, the weapon is held at a 45 degree angle across the chest with the barrel pointing left and skyward.

The weapon is never carried at Order Arms, when the rifle is held by the muzzle at the forward sight, while the butt of the weapon rests on the ground at the right toe or the soldier. Order arms may be called while at attention or at parade rest. The difference is that at parade rest, the weapon is held away from the body at arms length.

Soldiers may march with the weapon at port arms when certain conditions warrant such.

See FM 3-21.5 in the related link below for full text on Drill and Ceremony.