Flight 19 vanished in the Bermuda Triangle, it and the Mariner that searched for it were never found with its 14 crew, though it was thought to have suffered a mid-air explosion.

[2] The aircraft had multiple gun positions including single mounts at each midship beam and stern above the tail cone.

[5] Prior to the USA's entry into World War II, PBMs were used (together with PBYs) to carry out Neutrality Patrols in the Atlantic, including operations from Iceland.

Following Japan's attack on Pearl Harbor, PBMs were used on anti-submarine patrols, sinking their first German U-boat, U-158, on 30 June 1942.

[7] PBMs were responsible, wholly or in part, for sinking a total of ten U-boats during World War II.

Ten were still in service in 1955, although all were gone from the active Coast Guard inventory by 1958 (when the last example was released from CGAS San Diego and returned to the U.S. Navy).

These flying boats became the backbone of the long-range aerial search and rescue efforts of the Coast Guard in the early post-war years until supplanted by the P5M Marlin and the HU-16 Albatross in the mid-1950s.

[11] The British Royal Air Force acquired 32 Mariners, but they were not used operationally, with some returned to the United States Navy.

Data from Jane’s Fighting Aircraft of World War II[41]General characteristics Performance Armament