U.S. Air Force Senior Airman Tyler McMillanWammack, 20th Civil Engineer Squadron explosive ordnance disposal journeyman, assembles a water charge at Shaw Air Force Base, S.C., Dec. 14, 2017. The charge serves as a “water blade” intended to destroy improvised explosive devices and allow space to collect the debris. (U.S. Air Force photo by Senior Airman Christopher Maldonado)