A KC-135 Stratotanker refuels another KC-135 during a refueling mission. Members of the American Gold Star Mothers participated in a refueling flight in a KC-135 at the conclusion of a Mother's Day tribute May 4, 2010, at McConnell Air Force Base, Kan. American Gold Star Mothers is a national organization of mothers who have lost a son or daughter in service to the country. (U.S. Air Force photo/Senior Airman Abigail Klein)