Soldiers with Headquarters and Headquarters Company, 1st “Dragon” Battalion, 63rd Armor Regiment, 2nd Advise and Assist Brigade, 1st Infantry Division, United States Division – Center, listen to the final block of instruction detailing the standards of the clinch drill, the culminating exercise of Modern Army Combatives level one, Sept. 10, 2011, at Camp Liberty, Iraq. The clinch drill involves a student trying to close the distance between themselves and the instructor as fast as they can while exposed to being punched.