This might give you a starting point, website: Vietnam Veteran's Memorial Wall. They have an information column that address's particulars.
130 Annapolis (US Naval Academy) graduates were killed in the Vietnam War.
In the combat situations of today, there is little chance that a naval officer will be injured or killed in combat. There is a better chance that she or he would be injured in an accident.
The Naval Officer
Vietnam Naval Academy was created in 1955.
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Magaellan
An American Naval Officer is a commissioned officer in the US Navy or US Coast Guard.
There is no publicly available information on the death of Andreas Ioannides, a naval officer.
Naval actions and covert operations (which included some of the naval actions) were conducted against North Vietnam prior to 1965. The first "real" official (offensive) action against North Vietnam was in 1965, when the US launched an AIR CAMPAIGN against North Vietnam, titled "Operation Rolling Thunder."
William Gwin - naval officer - was born in 1832.
Robert Henley - naval officer - was born in 1783.