Q-111 Luzon was a motor torpedo boat of the United States Army during World War II as part of the Offshore Patrol based at Manila.

The Act was criticized because it did not include funding for a Commonwealth navy instead relying on the United States Asiatic Fleet.

On 9 February 1939, the Off Shore Patrol (OSP) was formed with its headquarters located at Muelle Del Codo, in the Port of Manila and was headed by U.S.

[7] After the Attack on Pearl Harbor, the squadron added two additional boats, converted launches that served as patrol boats, the Q-114 Danday (ex-Carmen, named after the wife of Jurado) and the Q-115 Baler (former tender of the presidential yacht BRP Banahaw (ex-Casiana, ex-Cassandra).

[8][9] The squadron patrolled the waters of the bay and protected the eastern shore of the Bataan Peninsula from Japanese infiltration.

[4] After Manila was declared an open city on 26 December 1941, the squadron operated out of Sisiman Cove [1], to the immediate east of Cavite and north of Corregidor where the American PT boats were also based.

[4] The squadron along with its American counterparts, were serviced by the submarine tender, Canopus which was moored at Cavite Naval Base.