Whether you call it CQB or CQC, close quarters fighting (like the kind needed to sweep and clear rooms of threats) operates on several, battle worn principles that can be difficult to master, but are easy to understand.
Krav Maga U.S. Marine Corp Krav Maga Close Quarters Combat U.S. Marine Corps Sgt. Sean R. Regan executes an Israeli Krav Maga knife technique during a Krav Maga obstacle course at Marine Corps Air Station Iwakuni in Yamaguchi, Japan. Training Marines Krav Maga, the Israeli Defense Force's official self-defense and close-quarters combat system. (U.S. Marine Corps photo by Cpl. Andrea M. Olguin/Released)