A nuclear fission debris tracker, generally referred to as Package B, has been flown aboard Defense Meteorological Satellite Program (DMSP) satellites since 1976. More recently, this instrument has been redesigned in order to obtain additional functions. Since June 1987, four redesigned instruments have been flown. The first portion of this report presents a detailed description of the recent instruments and orbital parameters. The second half of the report concentrates on data representing periods of background and events of scientific interest.