Col. E. John Teichert, 11th Wing and Joint Base Andrews commander, left, presents Col. Scott A. Grundahl with the 811th Operations Group guidon during the 811th OG change of command ceremony on Joint Base Andrews, Md., July 7, 2017. Grundahl relieved Col. Fred. C. Koegler III as commander of the group. 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)