Generally defined as a military rifle that uses a detachable magazine and an intermediate cartridge, and can be switched between semi-automatic and fully automatic fire, the assault rifle is often the primary weapon of the infantryman. Learn more in this episode of "5 Things You Don't Know About: Assault Rifles," hosted by Benari Poulten, a Master Sergeant in the U.S. Army Reserve and veteran of Operation Iraqi Freedom and Operation Enduring Freedom.