COLORADO SPRINGS, Colo.--The Air Force's top space officer supports the service potentially selling its roughly 1,000 excess ICBM motors, but for the right price and in the right quantity.Air Force Space Command (AFSPC) chief Gen. John Hyten said Thursday he is aware of the fine line between getting a return on the Air Force's investment of what he said is hundreds of millions of dollars spent over the years to keep these excess ICBM motors ready to fly. But he…