Contingency Response Top-Off course participants assigned to the 435th Contingency Response Group defend their position from a simulated aggressor during a tactical casualty care exercise at Rhine Ordinance Barracks, Germany, Aug. 3, 2017. The CR Top-Off training is a three-and-a-half day course teaching integrated defense, force protection, and tactical casualty care; skills the 435th CRG require while deployed. (U.S. Air Force photo by Senior Airman Elizabeth Baker)