2.2.2 Results. The NNTPR has identified and assigned external gamma doses to virtually all of the Navy test participants. The summaries in this section detail its fulfillment of assigned responsibilities. Response to File A Personnel. As of 1 May 1986, the NNTPR had mailed nearly 20,000 File A letters with final statements on participation and radiation dose to Navy personnel who had called in on the DNA toll-free number (5). Approximately 300 additional letters will be sent as dose reconstructions are completed. The NNTPR has also mailed more than 1,500 final letters to Hiroshima/Nagasaki occupation troops and to callers who did not participate either in the occupation or the nuclear tests (9). Assignment of Doses. The NNTPR has a recorded or a calculated radiation dose for nearly 99 percent of all Navy test participants. The team and its contractors assembled this information by searching through medical and historical records, by using film badge information, and by reconstructing doses when film badges were not available. The NNTPR has reviewed over 99 percent of the participants’ medical records (more than 105,000 records). Researchers accomplished most of this work during a 1-year period, when they examined about 1,700 records a week (6). Doses had to be reconstructed for more than half the Navy participants since only about 45 percent of these personnel in all the test series had recorded data on exposure. The effort was even greater for Operation CROSSROADS, conducted in 1946 at Bikini as the first postwar nuclear test series. Reconstructed doses were needed for all of the approximately 37,000 Navy participants in this operation. The NNTPR spent more time determining the doses for its CROSSROADS personnel than it did for Navy participants in all the other series combined. Commander R.T. Bell, present NNTPR Project Manager, acknowledged the challenge of CROSSROADS when he referred in an interview to the "massive effort" expended by the NNTPR and its contractors on dose reconstruction (6). 31