Tossing ASW back on the 378s

USCGC Mellon (WHEC 717) sits in full dress at the pier before a decommissioning ceremony in Seattle on Aug. 20, 2020. USCGC Mellon was a High Endurance Cutter homeported in Seattle and served as an asset in completing Coast Guard missions around the world for 52 years. (U.S. Coast Guard photo by Petty Officer 3rd Class Michael Clark)
The Hamilton class of Coast Guard cutters served the USCG well for over 50 years, including most working the Market Time gun line off Vietnam as well as standing toe-to-toe with the Soviet Navy in the Cold War.
Equipped from the beginning as a patrol frigate, they entered service starting in 1967 with a 5″/38 DP mount and an ASW suite that included the AN/SQS-38 sonar and Mk32 torpedo tubes for launching lightweight ASW torpedoes, first the Mk44, then the Mk46. They had to requal for both surface warfare and ASW every year and often bird-dogged Russki subs, especially off New England and in Alaska waters.

1972 Hamilton-class USCGC Boutwell (WHEC-719) close aboard a Soviet Submarine. USCG Historian’s Office. 230802-G-G0000-102.
During the late 1980s and early 1990s the Hamiltons a FRAM program that replaced the 5″/38 gun with the MK 75 76mm OTO, upgraded the MK 32 Surface Vessel Torpedo Tubes to Mod 7, installed MK 36 SRBOC launchers and the AN/SLQ-32 electronic warfare suite, added a CIWS and Harpoon capability, and upgraded the cutters’ air and surface search radars. This came in tandem with the ability to operate a Navy LAMPS I (Sea Sprite) helicopter should they need to clock in as convoy escorts.
Then, in 1996, the USCG got out of the ASW biz, pulling its tubes and sonar suites. Everyone figured it would never be needed again. After all, the world was at peace and sub-busting was so WWII.
In recent years, the Coast Guard retired all 13 of its long-serving Hamiltons and Uncle Sam has since gifted them to overseas allies. This included three sent to the Philippines– the former USCGC Hamilton (WHEC-715), renamed BRP Gregorio del Pilar (PF-15); USCGC Dallas (WHEC-716) renamed BRP Ramon Alcaraz (PF-16), and USCGC Boutwell (WHEC-719) as BRP Andres Bonifacio (FF-17).

Two Gregorio del Pilar-class frigates (former Hamilton-class cutters) of the Philippine Navy during naval exercises with the US Navy
And, it seems the Philippine Navy is fitting them for ASW once more, with ELAC SONAR GmbH, a German supplier of hydroacoustic systems, announcing recently that it completed sea acceptance tests of the HUNTER 2.0 hull-mounted sonar for the class.
The company notes:
HUNTER 2.0 is a hull-mounted sonar carrying out anti-submarine warfare (ASW) in active and passive modes in shallow and deep waters for panoramic detection of submarines and other objects.
As for teeth, the PI last year contacted with the UK SEA firm for its Torpedo Launcher System (TLS) for a class of corvettes being built in South Korea. It is not a stretch they could add a few more to the contract for the old Hamiltons, and in fact, the presser at the time said clearly: “The contract follows the successful delivery of SEA’s TLS for the Philippine Navy’s frigates.”
SEA’s TLS is a weapon-agnostic, close range and rapid-reaction system capable of firing a variety of NATO-compatible standard light weight torpedoes, including the US Mk44, Mk46 and Mk54 torpedoes, UK Sting Ray, Italian A244S, French MU90 and the Korean Blue Shark.




