Since the 1950's, the Lockheed C-130 Hercules has been a mainstay of military transport. Over nearly 60 years of service, more than 2000 have been built, and have seen service with over 60 nations around the world. With numerous variants, the aircraft has been employed as a troop transport, medical evacuation craft, and cargo transport platform. In addition, the Hercules has been employed as in numerous other roles, including gunship, refueling, aerial firefighting, and weather and scientific research support.