Staff Sgt. Scott Schroer (left), and Tech. Sgt. Ronda Bollinger, crew chiefs assigned to the 131st Bomb Wing, Whiteman Air Force Base, Mo., marshal a B-2 Spirit assigned to the 509th Bomb Wing from Whiteman AFB, June 23 at Nellis AFB, Nev. The aircraft maintainers from the 131st Bomb Wing are all Air National Guard members. The guard units, along with active duty units, are participating in total force integration with the U.S. Air Force Weapons School.