A data analysis is conducted on approximately 3900 underway replenishments in the Pacific Fleet between January 1984 and June 1985. The data was reported in accordance with COMNAVSURFPACINST 3180.2E. There are four results obtained in the study. The first result is that refueling transfer rates in NWP-14C, Replenishment at Sea compare favorably with the observed data for average value events. Secondly for single station conventional replenishment (CONREP) of ammunition and stores, short tons per hour as a transfer rate measure (the transfer rate in NWP-14C) is not a significant predictor of the required transfer time. Therefore this thesis recommends measuring conventional replenishment transfer rates rates in minutes per lift. Third a simple linear regression model is proposed to describe single station refueling and CONREP transfer rates. And finally a logarithmic multiple regression model is proposed to describe the total time required for an underway replenishment (UNREP), for situations in which several commodities are transferred. (KR).