You can get a copy of his complete military record at the NARA ...Form 180...
www.archives.govAncestry.com also has "WWII US Navy Muster Rolls" and shows his last time on the Medusa was the quarter ending March 30, 1940. He then was on the ship Vestal and a quarter on the Yorktown. He was at the US Naval Air Station San Diego, quarter ending Sept 30 1941 and still there quarter ending December 31, 1941. Service Number to order records:341 43 97
enlisted Dec 18, 1936.
Get a subscription to Ancestry and you can download and print out records. Or look at Fold3, they have Military databases.