Six hundred and twenty-nine cases of viral hepatitis (A, B, and NonA-NonB) were reported among a total of 768,832 United States Navy and Marine Corps personnel during 1984 and 1985 via a passive surveillance system. Cumulative incidence for all three hepatitis types was higher than those reported for the general population at the same time. Hepatitis B was the most common diagnosis within all sex, rank, and race/ethnic description categories. Enlisted medical personnel (hospital corpsmen) had a disproportionately higher incidence of hepatitis