Tech. Sgt. Christopher Pfeiffer, 374th Security Forces Squadron Advanced Combat Skills Assessment team lead, looks down the sight of a training weapon during building clearing training, May 23, 2017, at Yokota Air Base, Japan. The 374 SFS team regularly trained in tactics of clearing buildings of civilians and hostels for the 2017 Security Forces Advanced Combat Skills Assessment competition at Andersen Air Force Base, Guam. (U.S. Air Force photo by Airman 1st Class Donald Hudson)