single gun in tail turret) and increased range; 94 built as new plus 62 conversions. PBM-3D (Model 162D) Patrol bomber with increased power (two 1,900 hp (1,417 kW) R-2600-22s) and increased armament (twin 0.50 in machine guns in nose, dorsal, and tail turrets, plus two waist guns). 259 built. PBM-4 (Model 162E) Proposed version with two 2,700 hp (2,015 kW) Wright R-3350 engines; unbuilt. PBM-5 (Model 162F) Version with 2,100 hp (1,566 kW) Pratt & Whitney R-2800 engines; 628 built. PBM-5E Variant of PBM-5 with improved radar. PBM-5S Lightened anti-submarine variant of PBM-5. PBM-5S2 Improved anti-submarine aircraft with revised radar installation. PBM-5A (Model 162G) Amphibian version of PBM-5, with retractable tricycle undercarriage; 36 built plus four conversions. Mariner I British designation for 32 PBM-3B supplied to the Royal Air Force. Operators Argentine Navy purchased nine PBMs during the 1950s for the Argentine Naval Aviation, retiring its last Mariner in May 1962. Royal Australian Air Force No. 40 Squadron RAAF No. 41 Squadron RAAF Netherlands Naval Aviation Service VSQ 321 based at Biak Air Base, Dutch New Guinea operated 15 PBM-5As between 1955 and 1960 after the retirement of their PBYs. Royal Air Force ordered 33 aircraft but only 28 were delivered. 524 Squadron operated 28 Mariner Is from October–December 1943 under command of No. 15 Group Coastal Command. United States Navy ATU-1 ATU-10 ATU-501 VPB-2 VR-8 VR-10 VR-21 VPB-16 VPB-17 VPB-20 VP-21 VPB-27 VPB-34 VP-40 VP-46 VP-56 VPB-98 VPB-99 VPB-202 VPB-203 VP-204 VP-205 VPB-206 VPB-207 VP-208 VPB-209 VPB-210 VPB-211 VPB-212 VPB-213 VPB-214 VPB-215 VPB-216 VP-731 VP-892 VH-1 VH-2 VH-3 VH-4 VH-5 VH-6 United States Coast Guard National Navy of Uruguay purchased three PBM-5S2s in 1956, with the last retired on 3 February 1964. Surviving aircraft United States Navy PBM-5A (Bureau Number (BuNo) 122071) is the only surviving Mariner. It is on loan from the National Air and Space Museum in Washington, D.C. and is currently on display at the Pima Air & Space Museum adjacent to Davis–Monthan Air Force Base in Tucson, Arizona. Operated by the USN between 1948 and 1956, it is painted in the markings of Transport Squadron 21 (VR-21) and coded RZ 051 of the early 1950s. PBM-5 BuNo 59172 lies upside down under Lake Washington. It crashed on 6 May 1949, and after a number of unsuccessful attempts to recover the wreck over the following decades, it is now used as a training site for divers.<ref>"Martin