I find a Robert McKissick age 45 (abt 1906) born Ireland became NA 2/3/1938 living in Queens NY Ord Seaman on the ship USNS LST 694 for a voyage 3/27/1951 Getmo Bay Cuba to NY, NY April 2 1951. (Owner of ship U.S. Navy)
If he was on leave in U.S. then his death certificate would be filed in the county clerks or vital records office of the county/state he died. If he was on leave overseas and died his death certificate would be at the U.S. State Department in Washington D.C. Since he was buried in a Veteran;s Cemetery a copy of the dc or at least a burial permit had to be obtained from county the cemetery is in.