The military uses aircraft of all types and sizes for combat and intelligence missions, emergency search and rescue of personnel, transport of troops and equipment, and long-range bombing missions. Thousands of aircraft take off and land from land bases or aircraft carriers all over the world. Each successful mission requires the support of well-trained air and ground crews to operate some of the most modern, innovative, and high-tech aircraft in the world, including jets, helicopters, bombers, tankers, and turbo-propellors. Occupations in this career field focus on the in-flight and ground support operations for the transport of personnel and materials for airborne missions.