U.S. Soldiers with the 1st Squadron, 91st Cavalry Regiment, 173rd Airborne Brigade Combat Team cover their sector of fire March 20, 2014, during a mission rehearsal exercise (MRE) in Pfriemd, Germany. The MRE was conducted to prepare battalions assigned to the 12th Combat Aviation Brigade to deploy to Afghanistan to provide medical evacuation and combat support to the NATO International Security Assistance Force mission.