A Japan Maritime Self-Defense Force (JMSDF) ShinMaywa US-2 search-and-rescue amphibian conducted a joint casualty evacuation exercise with the Whidbey Island-class dock landing ship USS Ashland (LSD 48) on 27 April 2026 as part of Exercise Balikatan 2026, U.S. Indo-Pacific Command officials confirmed. The drill, which took place in the South China Sea, formed part of the multinational exercise’s joint medical training serials and highlighted growing interoperability between U.S., Japanese, and Philippine forces in maritime casualty evacuation and patient movement. Balikatan, the long-standing annual U.S.-Philippine bilateral exercise, has expanded in recent years to include deeper Japanese involvement as Tokyo strengthens its defense ties in the Indo-Pacific.
The US-2, operated by Air Rescue Squadron 71 (ARS-71) of the JMSDF’s 31st Fleet Air Wing, is a purpose-built four-engine turboprop amphibian optimized for open-ocean search-and-rescue (SAR) missions in high sea states. With a crew of 11 that includes paramedics and divers, the aircraft can accommodate up to 12 stretchers for casualty evacuation or 20 seated passengers. It is powered by four Rolls-Royce AE 2100J turboprops and features boundary-layer control technology that confers exceptional short takeoff and landing (STOL) performance, enabling water takeoffs in as little as 280 m and landings in 330 m at operational weights. The aircraft can operate in waves up to 3 m (Sea State 4–5) and has a maximum range of 4,700 km in the SAR configuration.
The JMSDF has operated the US-2 since 2007 as the successor to the older US-1A fleet. Six aircraft had been delivered by late 2018, with production continuing at ShinMaywa’s facilities in Japan. The type remains one of the world’s most capable dedicated maritime SAR platforms and has seen limited export interest, though no foreign sales have been concluded to date. Japan’s Joint Staff described the participation as part of broader efforts to enhance integrated joint operational capabilities and contribute to a “free and open Indo-Pacific” security environment. Officials emphasized that the training addresses real-world challenges posed by the region’s geography, where rapid casualty evacuation could prove decisive in both humanitarian assistance/disaster relief (HADR) scenarios and potential contingency operations.
During the Balikatan serial, the US-2 practiced transferring simulated casualties from the sea or small boats to the USS Ashland’s flight deck or well deck, demonstrating seamless integration between the JMSDF amphibian and U.S. Navy amphibious shipping. The exercise underscored the aircraft’s unique ability to conduct rapid patient evacuation in vast oceanic theaters where distances to shore-based medical facilities can be extreme and traditional rotary-wing assets may be range- or sea-state-limited. The Balikatan 2026 casualty evacuation drill is the latest in a series of JMSDF–U.S. Navy interoperability events that reflect Tokyo’s evolving security posture and Washington’s push for a networked alliance architecture in the Western Pacific. No injuries or equipment issues were reported during the exercise.
