The military performs heavy airdrops from both C-17 and C-130 transports. A C-130 drops cargo at an airspeed of 140 knots (161 mph) while flying at least 750 feet above ground level. The aircraft tows a small, 15-foot drogue chute for 5 to 10 seconds before the navigator gives the green light to drop the cargo. At that point, the loadmaster releases the drogue, the sole purpose of which is to pull out the larger, 22-foot extraction chute.