A maintainer assigned to the 34th Expeditionary Bomb Squadron, Ellsworth Air Force Base, S.D., prepares to marshal a B-1B Lancer for take-off during Exercise Valiant Shield at Andersen AFB, Guam, Sept. 18, 2020. Valiant Shield is a series of military exercises that promote integration and interoperability among joint forces. Each successive exercise builds on lessons learned from the previous training to validate and enhance complementary capabilities and develop new tactics, techniques and procedures. (U.S. Air Force photo by Staff Sgt. Nicolas Z. Erwin)