(Right to left) Airman Mark Vadnais and Airman 1st Class Christian Mains, 28th Aircraft Maintenance Squadron able chiefs, sign out tools and technical orders from the 28th AMXS maintenance shop at Ellsworth Air Force Base, S.D., Jan. 21. Both Airmen are undergoing on-the-job training to maintain the B-1B Lancer. (U.S. Air Force photo/Senior Airman Anthony Sanchelli)