20-26. A complete control group is required for airdrop operations involving multiple fixed-wing aircraft, or for single aircraft operations on drop zones more than 2100 meters in length, or if there is at least 20- seconds of exit time (“green light”). If any three of these conditions apply:The DZSO ensures the ground support team is in place on the DZ one hour before the drop. The support team includes:Assistant DZSO (not required for U.S. Navy or U.S. Air Force operations, however if present, must be a current and qualified DZSTL).Two field litter ambulances or emergency medical service vehicles with appropriate supplies and medical support personnel; U.S. Marine Corps, U.S. Navy, and U.S. Air Force require one qualified support person.The senior medic should be positioned on the DZ to best supervise medical operations. The senior medic must have communications with the DZSO at all times.Malfunction officer with still and video cameras. (See chapter 23 for MO requirements.)Parachute recovery detail with saw and tree climbing equipment.Parachute turn-in detail with vehicles.