Maintenance Duty Airman 1st Class Sheila Tilden, an aircraft structural maintenance journeyman 436th Maintenance Squadron, shows Air Force Gen. Jacqueline Van Ovost, Air Mobility Command commander, how to manufacture tubing for aircraft at Dover Air Force Base, Del., Dec. 8, 2020. SHARE: Download: Full Size (1.21 MB) Credit: Air Force Senior Airman Christopher Quail VIRIN: 201208-F-NX530-1126C.JPG Photo Gallery