It was a night MARE
Trooper First Class David Castillo, Delaware State Police, Troop 3, left; Master Cpl. Michael Wisniewski, Dover Police Department, Dover, Del., second from left; Trooper Christine Armstrong, DSP, Troop 3, second from right; and Sgt. Bruce Harris, DSP, Troop 3, right, sweep the warehouse section of building 639 during a simulated active shooter exercise Oct. 20, 2015, on Dover Air Force Base, Del. Staff Sgt. Craig Eveland, 436th Security Forces Squadron military working dog handler and MWD Ramos kept watch to the rear of the sweep team while searching for hostages and simulated dead or injured victims. (U.S. Air Force photo/Roland Balik)