20-33. A partial control group can be used for airdrop operations involving single aircraft if less than a 20- second exit time exists or if there is less than 2100 meters of usable DZ. The composition of a partial control group is:Assistant DZSO (DZSTL qualification is not required).Wind reading from a single location on the DZ.One medic (with field litter ambulance or emergency medical service vehicle with appropriate supplies and medical support personnel); U.S. Marine Corps and U.S. Navy require one qualified Navy corpsman.Malfunction officer with still and video cameras, binoculars, and NVDs for night operations.Parachute recovery detail.20-34. The DZSO has operational responsibility for the drop zone. In addition to the DZSOs duties for drop zones, the DZSO must also:Be positioned at the personnel point of impact 15 minutes before drop time. The assistant DZSO is at the highest point of the drop zone or at a location determined by the DZSO if the DZSO is at the highest point of the drop zone. For combination airdrop operations, the DZSO or DZSTL must follow the procedures for heavy drop operations, but relocate to the personnel point of impact to conduct personnel drops after the heavy equipment drops have landed.Note. For heavy drop operations, the DZSO or DZSTL should be no closer than 300 meters from the heavy equipment point of impact and should not be positioned under the direction of flight.Relay a ground weather decision and CLEAR TO DROP or NO DROP signal to the lead aircraft two minutes before the drop for each pass.During night drops, ensure all lights that are on or next to the drop zone and are not a part of the drop zone marking system are turned off five minutes before drop time and remain off during the drop (except those lights that mark obstacles).Contact the pilot of the aircraft immediately after the drop and ask if any personnel or equipment did not drop. He relays this information to the Airborne commander or DACO for accountable purposes.