majority participated in the air support services conducted primarily by Air Force persannel from the Special Weapons Command (SWC) and Headquarters, Air Force. At each event, air support activities included the airdrop of the nuclear device, cloud sampling, cloud tracking, aerial surveys of the terrain, and courier service. Air Force personnel also provided meteorological services and communications security and monitored worldwide radioactivity from the RANGER test for the Atomic Energy Detection System. Since RANGER was only a 13-day operation, the same units and participants performed the same duties throughout the series (6: 1). 4.4.4 Dose Summary for Operation RANGER. The summary table given below indicates that four doses exceeded the 3.0-rem limit of gamma radiation per 13-week period (6: 3): Summary of External Doses for Operation RANGER as of 1 May 1986 Gamma Dose (rem) 0-0.5 é 0.5~1 1-3 3-5 5-10 10+ Army 8 2 2 2 0 0 Navy 3 1 0 1 1 0 213 0 0 0 0 0 Marine Corps 0 1 0 0 0 0 Civilian DOD Participants 17 6 9 0 0 0 Air Force 4.5 OPERATION GREENHOUSE. GREENHOUSE was the fourth postwar atmospheric nuclear weapons test series. Conducted in 1951 on the northeastern islands of the Enewetak Atoll, 83