Captain Eric Poland, a 34th Bomb Squadron B-1B Lancer pilot, reviews a pre-flight checklist as part of exercise Combat Raider 21 at Ellsworth Air Force Base, S.D., July 20, 2021. Combat Raider is designed to train aircrew on realistic scenarios that support a full range of operations against modern threats and replicate modern day contingency operations. (U.S. Air Force photo by Airman 1st Class Quentin K. Marx)

Col. Nathan Mitchell, the 28th Maintenance Group incoming commander, gives a speech during his change of command on Ellsworth Air Force Base, S.D., August 4, 2021. Mitchell arrived from Malmstrom Air Force Base, Montana, where he commanded the 341st Maintenance Group for two years (U.S. Air Force photo by Airman 1st Class Jonah Fronk)

Two armament systems specialists from the 28th Aircraft Maintenance Squadron move an explosive during the 28th Maintenance Group Load Competition at Ellsworth AFB, S.D., July 21, 2021. The load crews practiced their ability to load weapons in a safe, reliable and timely manner. (U.S. Air Force photo by Airman 1st Class Quentin K. Marx)

Col. Joseph Sheffield took charge of the world’s largest operational B-1B wing during the 28th Bomb Wing change of command ceremony in the Pride Hangar on Ellsworth Air Force Base, S.D., June 18.