Staff Sgt. Alfred Vassallo, 11th Security Support Squadron combat arms instructor, shows Maj. Gen. James A. Jacobson, Air Force District of Washington commander, how to shoot an Heckler and Koch MP5 9mm submachine gun at Joint Base Andrews, Md., Oct. 12, 2017. Jacobson’s visit at the combat arms training and maintenance range was part of his immersion tour to become more familiar with the multiple missions of JBA’s units and meet with America’s Airmen. (U.S. Air Force photo by Airman 1st Class Valentina Lopez)