Trying to track service record (WWII) for deceased Merchant Marine father. Are there lists of said vessels in the Pacific during WWII? And if so are there lists of crews and officers?

John E. Reardon served in the Merchant Marines in the Pacific campaign of WWII.  Roughly from 1941-1945.  He died in 1973.  We cannot find any records of his service.  Do have him on the roster of a couple of ships.  Any ideas?