Bumping Fists Air Force Brig. Gen. Jeffrey Pennington, Fourth Air Force commander, greets two airmen following training at the Tactics and Leadership Nexus, Dover Air Force Base, Del., Oct. 17, 2020. SHARE: Download: Full Size (2.7 MB) Tags: training, lethality, air force Credit: Air Force Tech. Sgt. Jensen Stidham VIRIN: 201017-F-SX095-9009F.JPG Photo Gallery