446th ASTS experience bolsters multinational exercise Mobility Guardian Published Aug. 16, 2017 By David L. Yost 446 Airlift Wing Public Affairs JOINT BASE LEWIS-MCCHORD, Wash. -- The 446th Aeromedical Staging Squadron describes how a multinational exercise like Mobility Guardian works from the perspective of the Air Force Reserve. USAF. (U.S. Air Force Graphic by Rosario "Charo" Gutierrez) Photo Details / Download Hi-Res USAF. (U.S. Air Force Graphic by Rosario "Charo" Gutierrez)