The boom of a Michigan Air National Guard KC-135 Stratotanker assigned to the 171st Air Refueling Squadron settles into place on the nose of a B-1 bomber assigned to the 28th Bomb Wing at Ellsworth Air Force Base, S.D., April 1, 2016. The Air National Guard and Air Force Reserve fly more than half of Air Mobility Command’s fleet of Stratotankers. (U.S. Air Force photo by Senior Airman Rebecca Imwalle/Released)