U.S. Army Lt. Col. Richard Coyle the commander of the 7th Squadron, 17th Cavalry Regiment “Pale Horse”, 159th Combat Aviation Brigade “Thunder” salutes as he leads his squadron with colors cased past the reviewing stand, during the pass in review at the brigade inactivation ceremony at the 101st Airborne Division parade field, Fort Campbell, Ky., May 7, 2015. The 159th cased its colors after 18 years of service to the 101st Airborne Division and the nation, dating back to the Vietnam era. The brigade inactivated because the Army is restructuring the size of its aviation force. (U.S. Army Photo by Sam Shore/Released)