Col. E. John Teichert, 11th Wing and Joint Base Andrews commander, left, Col. Fred C. Koegler III, center, and Col. Scott A. Grundahl, right, stand during the 811th Operations Group change of command at Joint Base Andrews, Md., July 7, 2017. Grundahl relieved Koegler as commander of the 811th OG. The group consists of the 811th Operations Support Squadron and the 1st Helicopter Squadron both of which provide the National Capital Region with continuous rotary-wing contingency response. (U.S. Air Force photo by Christopher Hurd)