Tons of debris built up at the entrance to the Cheyenne Mountain Air Force Station following heavy rainfall and a resulting rock slide in September 2013. The 4th Infantry Division, with support by the 615th Engineer Company, 52nd Engineer Battalion, of Fort Carson cleared away the debris from a rockslide and uprooted trees. The storm and resulting debris did not limit the Air Force Station's operations, according to the 721st Mission Support Group's commander Col. Travis Harsha, who became commander on July 11, 2013 for the now retired Col. Joseph Turk.