A new type of aircraft modification contract, focused on non-structural avionics, electrical and mechanical upgrades, is to return U.S. Air Force C-5M Super Galaxy transports by Lockheed Martin [LMT] to service more rapidly than traditional contracting, the Air Force Life Cycle Management Center (AFLCMC) said this month. Lockheed Martin delivered the C-5, the largest plane in the Air Force inventory, between 1970 and 1989. The 52 C-5Ms are re-engined earlier versions of the C-5. Last October, AFLCMC's Mobility and Training…