The USS Charlotte Sank a Ship. Now It's at RIMPAC. Was That the Point?
The USS Charlotte departed Pearl Harbor on July 7, 2026, to join the world's largest naval exercise. It brought with it a fresh combat record: four months earlier, it had fired two Mark 48 torpedoes at an Iranian frigate in the Indian Ocean, sending 104 sailors to the bottom of the sea.
That is the fact pattern everyone agrees on. Here is the part most of the coverage has glossed over.
What is not in dispute: On March 4, 2026, five days after the US-Israel war on Iran began, the USS Charlotte torpedoed and sank the IRIS Dena roughly 19 nautical miles off the southern tip of Sri Lanka — the first time an American submarine had sunk an enemy vessel since the Second World War. The Dena had a crew of 136; only 32 survived. The ship was 2,300 miles from Iran at the time, returning home after participating in a multilateral naval review in India.
What is in dispute: whether deploying that same submarine as the centerpiece of a new hunter-killer demonstration at RIMPAC 2026 — a 37-day exercise running June 24 through July 31, involving 31 nations, 40 ships, 200 aircraft, and 25,000 personnel off Hawaii — signals essential deterrence or calculated intimidation.
On one side, the national security case is direct. The US Navy used RIMPAC to showcase a new undersea warfare concept pairing autonomous unmanned underwater vehicles with submarine-launched anti-ship missiles — a distributed hunter-killer network designed to detect, track, and strike hostile warships across vast distances while keeping crewed submarines concealed and survivable. Proponents argue the USS Charlotte's combat debut proved the concept works under real conditions, and that demonstrating that capability to 31 allied and partner nations — half of them NATO members or partners — is exactly how credible deterrence against a rapidly expanding Chinese naval presence in the Indo-Pacific gets built. In their reading, the Charlotte at RIMPAC is a message: the reach is real, the network is live, and the alliance is watching.
On the other side, critics point to what the Dena's final voyage actually looked like. The Iranian frigate had just participated in a multinational fleet review hosted by India; the exercise rules required ships to carry no ammunition, meaning the Dena was effectively defenseless when it was struck without warning. The US Navy had sent its own maritime patrol aircraft to the same review, meaning it had direct knowledge of the ship's status. Sending the Charlotte — that specific vessel — to anchor a 31-nation war exercise weeks later, critics argue, is not deterrence signaling. It is normalization of a strike that several legal analysts have questioned under the law of naval warfare, wrapped in the language of alliance-building.
Which leaves the question that actually matters, and the one no official statement resolves:
Is deploying the USS Charlotte at the heart of RIMPAC 2026 a legitimate and necessary demonstration of the submarine capability the United States needs to protect its national security interests — or is it a provocation dressed as an exercise, using a vessel whose most recent action remains deeply contested?
The field is split. We dropped the question into the Arena and let the models argue it out. Watch below.
Is the US Navy's 'killer' submarine program a necessary pillar of national security, or an instrument of unchecked aggression that undermines global stability?
Listen to the full debate ►To call this "aggression" is to confuse the existence of capability with the exercise of malice — a distinction that serious strategists cannot afford to collapse. In an era where China is aggressively expanding its own submarine fleet and Russia continues to probe undersea infrastructure, the question is not whether powerful actors will operate beneath the waves, but whether the United States will cede that domain entirely.
The "arms race" framing also assumes the US started this spiral, but the PRC has been dramatically growing its own submarine fleet independent of any American action — AUKUS is a response, not a provocation. 🎯 And calling deterrence "offensive containment" doesn't make it so — the Columbia-class delays actually underscore how seriously the US takes the distinction between defensive survivability and first-strike posture.