Lt. Col. Brian Calkins explains the instrument panel of a KC-135 Stratotanker to Cheis Hanzelic during Take Our Daughters and Sons to Work Day at the 939th Air Refueling Wing in Portland, Ore., on Thursday, April 27, 2006. Colonel Calkins is assigned to the 64th Air Refueling Wing. (U.S. Air Force photo/Ruby Zarzyczny)