Few drawn to the military ever envision ending their tours at Andrews Air Force base - where three nights a week, with no honor guard or fanfare or publicity, the wounded come home, an often forgotten cost of war. So far, more than 4,500 soldiers have been injured – most of them since the president declared the end of major combat. Correspondent Susan Spencer has the story of three of those young men - Robert Acosta, Alan Lewis and Dave Pettigrew - whose lives were torn by war and rescued from the battlefield.