The host unit at Andrews is the 316th Wing, assigned to the Air Force District of Washington. It is responsible for maintaining emergency reaction rotary-wing airlift and other National Capital Region contingency response capabilities critical to national security and for organizing, training, equipping and deploying combat-ready forces for Air and Space Expeditionary Forces (AEFs). The 316th Wing also provides installation security, services and airfield management to support the President, Vice President, other U.S. senior leaders and more than 50 tenant organizations and federal agencies.