addresses and succeeded in contacting 40 of the volunteer observers, as noted in chapter 2 (13). In June 1979, the DOD notification and VA medical examination program was expanded to include all veterans with doses over 5.0 rem in 12 consecutive months. Five rem is the current Federal guideline for allowable annual dose to radiation workers. The program now includes 1,430 personnel, about 70 percent of whom have been contacted by the NIPR teams. This is a high percentage considering the difficulty of proceeding from records 25 to 40 years old to find the current addresses. The physical examinations given by the VA to these personnel indicate a lower incidence of cancer than the national average (13). The seventh NTPR task, sponsorship with DOE of an NAS mortality study of test participants, concluded in May 1985 with publication of Studies of Participants in Nuclear Tests. The study, conducted by the NAS National Research Council, was done on a cohort of 46,186 participants in Operations GREENHOUSE (1951), UPSHOT-KNOTHOLE (1953), CASTLE (1954), REDWING (1956), and PLUMBBOB (1957) (19). Chapter 8 discusses this effort, along with the other major followup studies of test participants. DNA and the NTPR teams have also completed the eighth task, research on the U.S. occupation of Hiroshima and Nagasaki. DNA issued a detailed fact sheet about the occupation forces on 6 August 1980 and has since provided the document to all occupation personnel who have called or written DNA. A detailed dose reconstruction, using assumptions chosen to give an estimate of the maximum possible dose, has also been completed. The conclusion, reported in chapter 6, is that the radiation doses received by members of the occupation forces were negligible (20). Finally, each NTPR team has assembled extensive data about each nuclear test series and shot for which it had any identified participants. The teams provide claims assistance to individuals and to the VA, which requests their help in documenting participation and determining radiation dose. 18