U.S. Coast Guard and Canadian Navy execute replenishment-at-sea drill at RIMPAC 2026
The two services performed a live logistics transfer at sea during the Rim of the Pacific exercise, underscoring expanding North American maritime interoperability.
- U.S. Coast Guard and Royal Canadian Navy completed a live RAS drill during RIMPAC 2026.
- The exercise included joint training with Mexico and the Philippines, and multinational Poseidon crews.
- Analysts view the drill as a confidence‑building step amid rising Pacific tensions.
- Future RIMPAC events will expand joint logistics and cyber‑security training.
The United States Coast Guard and the Royal Canadian Navy completed a replenishment‑at‑sea (RAS) operation on June 23, 2026, as part of the biennial Rim of the Pacific (RIMPAC) war games. The maneuver, conducted in the central Pacific, marked the first time the two nations practiced underway fuel and supply transfer together during the exercise, a tangible sign of deepening coordination in a region of rising strategic competition.
Core developments
According to a DVIDS release, the RAS drill involved a U.S. Coast Guard cutter and a Canadian Navy ship approaching within 30 feet of one another to transfer fuel and provisions while maintaining a steady course and speed. The operation was overseen by senior officers from both services, who verified that safety protocols and communication procedures were adhered to throughout the 45‑minute exercise.
RIMPAC 2026, hosted by the U.S. Navy, featured more than 25 nations and over 50,000 personnel. In addition to the North American RAS, the Coast Guard partnered with the Mexican Navy and the Philippine Coast Guard for separate training events, as reported by DVIDS. Those sessions focused on board‑and‑search tactics, maritime domain awareness, and joint search‑and‑rescue drills, expanding the scope of cooperation beyond logistical support.
USNI News highlighted another dimension of multinational integration: crews from Canada, Japan, Australia, and other Pacific allies flew aboard U.S. Navy P‑8 Poseidon maritime patrol aircraft for the first time during RIMPAC. The mixed crews practiced anti‑submarine warfare, intelligence sharing, and long‑range surveillance, reinforcing a broader push to standardize tactics across allied air assets.
In a separate USNI Pulse briefing dated July 17, 2026, analysts noted that the RIMPAC opening ceremony, hosted by the U.S. Navy’s Pacific Fleet, featured a reception for partner nations that emphasized “shared security responsibilities” in the Western Pacific. The ceremony set the tone for a series of joint operations that ranged from surface warfare drills to humanitarian assistance simulations.
Why it matters
Replenishment‑at‑sea capability is a cornerstone of sustained naval presence. By practicing RAS together, the United States and Canada demonstrate that their vessels can remain on station longer without returning to port, a critical advantage when operating across the vast Pacific theater. The drill also validates joint communication links, which are essential for coordinated responses to natural disasters, maritime accidents, or potential conflicts.
Strategically, the exercise sends a clear signal to regional actors—particularly China, whose naval buildup in the South China Sea has prompted allied nations to showcase collective resolve. The inclusion of multiple partners, from Mexico to the Philippines, illustrates a networked approach to maritime security that extends beyond the traditional U.S.–Canada axis.
Logistically, the RAS event tests equipment interoperability. The U.S. Coast Guard and Royal Canadian Navy use different refueling rigs and fuel specifications; successful transfer confirms that standardization efforts spearheaded by NATO and the North Atlantic Treaty Organization’s Maritime Interoperability Working Group are bearing fruit.
Reactions and viewpoints
Officials from both services praised the drill. A senior Coast Guard officer, speaking to DVIDS, said the operation “demonstrates the high level of trust and professionalism that exists between our two maritime forces.” A Canadian Navy spokesperson echoed the sentiment, noting that the RAS “enhances our ability to operate seamlessly with our U.S. partners in the Pacific.”
Analysts at USNI offered a more measured perspective. While they acknowledged the operational success, they cautioned that RAS drills alone do not address the broader challenges of anti‑access/area‑denial (A2/AD) environments that could complicate refueling in contested waters. The USNI Pulse commentary suggested that future RIMPAC editions might incorporate contested‑scenario RAS drills to test resilience under simulated threat conditions.
Regional observers in the Philippines and Mexico, whose coast guards also trained with the U.S. Coast Guard, highlighted the practical benefits of shared best practices. A Philippine Coast Guard representative, referenced in a DVIDS release, emphasized that joint training “improves our readiness to respond to maritime emergencies in our archipelagic waters.”
What’s next
RIMPAC 2026 will continue through early August, with scheduled anti‑submarine warfare exercises, live‑fire drills, and humanitarian assistance simulations. The U.S. Navy plans to rotate additional partner crews onto its P‑8 Poseidons for the remainder of the exercise, expanding the multinational air component.
Both the Coast Guard and the Canadian Navy have indicated intent to institutionalize the RAS drill as a recurring element of their annual joint training calendar. In parallel, discussions are under way to explore joint cyber‑security exercises, reflecting the evolving nature of maritime threats.
Looking ahead, the allied maritime community is expected to convene at the next Pacific Security Forum in 2027, where lessons learned from RIMPAC 2026—including the successful RAS operation—will inform policy recommendations on logistics interoperability and collective response frameworks.