7-13. Individuals must meet the following prerequisites to be appointed as an assistant drop zone safety officer ADZSO): Be a commissioned officer, warrant officer, or NCO (U.S. Army and U.S. Navy: E-5s or above;U.S. Marine Corps and U.S. Air Force: E-4s or above) Be a current and qualified JM for personnel or heavy equipment drop. Be certified as an ADZSO by having attended one of the following: U.S. Army Infantry School (USAIS) Jumpmaster Course (for computed air release point [CARP] DZs only). The U.S. Army Advanced Airborne School JM Course (for CARP DZs only). U.S. Army Special Operations Command (USASOC) Jumpmaster Course. To be ADZSO current, the ADZSO must have performed the duties of a DZSO or assistant DZSO within the preceding 180 days, graduated jumpmaster school within the last 180 days, or completed a Jumpmaster Refresher course within the preceding 180 days.Note. For combination airdrop operations, the DZSO and ADZSO must follow the procedures for heavy drop operations, but observe the jumpers as they exit the aircraft.7-14. Individuals must meet the following prerequisites to be appointed as a DZSTL: Be a commissioned officer, warrant officer, or NCO (U.S. Army and U.S. Navy: E-5s or above;U.S. Marine Corps and U.S. Air Force: E-4s or above). Be a current and qualified JM for personnel or heavy equipment. Be certified as a DZSTL by having attended one of the following: USAIS Pathfinder Course. USAIS Jumpmaster Course (for CARP DZs only). The U.S. Army Advanced Airborne School JM Course (for CARP DZs only). USASOC Jumpmaster Course. Have observed and assisted a current and qualified DZSTL performing their duties during an airdrop operation involving personnel or heavy equipment. To be DZSTL current, the DZSTL must have performed the duties of a DZSTL or assistant DZSTL within the preceding 180 days or completed a DZSTL refresher course taught by current DZSTL personnel within the preceding 180 days.Note. DZSTLs and ADZSOs in support of CDS airdrops are not required to be Airborne qualified, on jump status, or JM qualified and current, but they must have attended an authorized pathfinder course. For combination airdrop operations the DZSO and DZSTL must follow the procedures for heavy drop operations, but observe the jumpers as they exit the aircraft.7-15. Individuals must meet the following prerequisites to be appointed as a MO: Be a commissioned officer, warrant officer, or NCO (U.S. Army and U.S. Navy: E-5 or above;U.S. Marine Corps and U.S. Air Force: E-4 or above) The individual must be a qualified parachute rigger from the unit providing the air items used during the operation according to AR 59-4. For the U.S. Marine Corps only: a U.S. Marine Corps MO will be a parachute rigger NCO, E–4 or above, or JM qualified, E–5 or above, and must be appointed in writing by the commanding officer and must receive unit-level refresher training annually. The MO will be from the organization that provides the air items. For the U.S. Navy only: malfunctions officers will meet qualification, training, currency, and equipment familiarity requirements according to AR 59-4. The malfunction officer does not have to be from the organization providing the air items but must be maintenance or operationally qualified on all equipment used during the operation. For the U.S. Air Force only: DZC and DCSO will fill the duties as the MO and be designated in writing as an MO. They will have a thorough understanding of the parachute equipment used for the operation. U.S. Air Force combat control personnel are authorized to perform the duties of an MO during unilateral operations.