Retired Navy Rear Adm. Garrett Lansing Schuyler, 91, a specialist in ordnance, died of cancer Tuesday, at his home in Georgetown.

Much of his duty was with the Navy's Bureau of Ordnance here. His last assignment before retiring Jan. 1, 1947, was with the bureau's scientific advisory board.

Born in New York City, Adm. Schuyler graduated from the Naval Academy at Annapolis in 1906. After serving on the battleship U.S.S. Virginia, he was assigned to the Bureau of Ordnance in 1909.

He saw duty at the Naval Proving Ground at Indian Head and aboard the battleships U.S.S. Georgia and U.S.S. Pennsylvania before World War I, when he was sent to London as assistant naval attache.

During the war, Adm. Schuyler came under fire when he was sent to France in connection with French heavy land batteries and the U.S. naval railway battery at St. Nazarre. He received the Navy Cross.

After duty with the Office of Naval Intelligence, the battleship U.S.S. Mississippi, and at the Naval Proving Ground at Dahlgren, Va., he returned to the Bureau of Ordnance in 1934.

He served on a special board on ordnance during a period of outstanding development in high explosives, aviation ordnance and antiaircraft fire control systems. For his service during World War II, he received the Legion of Merit.

In 1946, Adm. Schuyler attended the A-bomb tests at Bikini as a member of the scientific advisory board.

His other decorations included the Order of the British Empire and the French Legion of Honor.

He was a member of the Army and Navy Club, the American Seismological Society and the Cosmos Club.

There are no immediate survivors.