carlisle albert herman trost (april 24, 1930 – september 29, 2020) was a united states navy officer. he was the 23rd chief of naval operations (cno) and a member of the joint chiefs of staff from 1 july 1986 to 29 june 1990. he retired from active naval service on 1 july 1990, following completion of a four-year term as cno.