By mid- 1941, Admiral Thomas C. Hart was appointed the commander; the fleet was based at Cavite Naval Base and Olongapo Naval Station, and the headquarters for this unit was at the Marsman Building in Manila.
By mid- 1941, Admiral Thomas C. Hart was appointed the commander-in-chief of the fleet. It was based at Cavite Naval Base and Olongapo Naval Station on Luzon, with its headquarters at the Marsman Building in Manila.