 Marines are known for making an impression, and sometimes, this means blowing a hole in the side of a building. The method of entry school at Quantico, Virginia teaches Marines to breach and clear houses using sledgehammers, saws, and everyone's favorite explosives. Staff Sergeant Jordan Halberson says the course teaches Marines a vital tactical advantage, the element of surprise. Speed, surprise, and violence of action. Once you put an explosive on a wall, building a door, what have you, it goes boom. It's going to be a surprise to them. There's going to be no knowing that we're coming until the explosion happens. The course is given to selected Marines from Explosive Ordinance Disposal Units, Special Operations Command, Military Police, and Forest Reconnaissance. Reporting from Quantico, I'm Lance Corporal, John Tucker.