The aircraft also served with airlift and air mobility wings of the Air Force Reserve (AFRES), later renamed Air Force Reserve Command (AFRC), the Air National Guard (ANG) and, later, one air mobility wing of the Air Education and Training Command (AETC) dedicated to C-141, C-5, C-17 and KC-135 training. The Lockheed C-141 Starlifter is a long range strategic airlifter, designed for transporting large quantities of either cargo or passengers. It is powered by an arrangement of four TF33 turbofan engines, each capable of generating up to 21,000 pounds-force (93 kN) of thrust; these were installed in pods beneath the high-mounted swept wing. The underside accommodates the retractable tricycle landing gear, consisting of a twin-wheel nose unit and four-wheel main units, the latter of which retract forward into fairings set onto each side of fuselage. The flight deck is typically operated by a crew of four. The use of a high-mounted wing enabled internal clearance in the cargo compartment of 10 feet (3.0 m) wide, 9 ft (2.7 m) high and 70 ft (21 m) long. Accordingly, the C-141 was capable of carrying, for example, a complete LGM-30 Minuteman intercontinental ballistic missile (ICBM) in its container; it was capable of carrying a maximum of 70,847 pounds (32,136 kg) over short distances, and carry up to 92,000 pounds (42,000 kg) when appropriately configured to carry the Minuteman, which lacked other equipment. In terms of personnel, the aircraft could carry a maximum of 154 fully-equipped troops, 123 paratroops or 80 litter patients at a time. In practice, it was discovered that under typical conditions, the cargo deck of the C-141A would run out of volume before the maximum weight value could be reached. For more details of the development and esign of the Starlifter click here.