
USCGC Duane on North Atlantic Convoy Duty. AS seen from USCGC Spencer.
The US Naval Institute September Proceedings includes an argument that major cutters need to be prepared to take on anti-submarine equipment. In an long war the author envisions the Coast Guard will ultimately have their own ASW equipment but recognizes that initially the helicopters, towed array sonar, and crews could be Navy..
The author, a submariner, also believes the equipment could help with peace time missions.
Important, ASW investment would offer immediate peacetime benefits. Enhancing the Coast Guard’s underwater surveillance capabilities would directly strengthen its border security and counternarcotics missions, improve boarding team safety, and extend interdiction range in the maritime domain. Many of the technologies necessary for submarine detection would be valuable in locating low-profile drug smuggling vessels, including go-fast boats and semisubmersibles. (See “Interdicting Narcotics at Sea,” pp. 10–11, August 2025.) These crafts’ minimal radar and visual signatures pose detection challenges similar to those of modern diesel-electric submarines.
There were good reasons ASW equipment was removed from the 378s in 1991 as the Soviet Union fell apart, but things have changed. I would expect the Chinese to use their conventional submarines to lie in wait for US submarines and aircraft carriers in the Western Pacific. They are unlikely to engage American subs with their own SSNs. I think they are more likely to engage US logistics with their SSNs. The US Navy does not want to divert highly capable AAW assets to convoy escort but currently those are the only type of escorts the Navy has.