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NEWS | July 28, 2022

Multinational Partners Conducted a Multi-Domain Sinking Exercise

By Courtesy Story Commander, U.S. 3rd Fleet

PACIFIC OCEAN -- Multinational partners conducted a multi-domain sinking exercise (SINKEX) in the Hawaiian Islands operating area as part of exercise Rim of the Pacific 2022 Friday, July 22.

Air, land, and sea units from Japan and the U.S. sank the decommissioned Austin-class amphibious transport dock ship ex-USS Denver (LPD 9) in waters more than 15,000 feet deep and over 50 nautical miles North of Kauai. With oversight and coordination by the multinational combined task force, the SINKEX enabled partner nations to gain proficiency in tactics, targeting and live firing against a surface target at sea.

From the land, the Japanese Ground Self-Defense Force and U.S. Army shot Type 12 surface-to-ship missiles and practice rockets.

Japanese Ground Self-Defense Force (JGSDF) Maj. Gen. Shigeo Kaida, director of the Operations Support & Training Department at the Ground Staff Office in the Japanese Ministry of Defense, talked about the importance of the training opportunity the SINKEX provided.

“This sink-at-the-sea exercise demonstrates current operational capabilities and tactical skills, and provides a valuable opportunity to coordinate and collaborate between Japanese Type 12 Surface-to-Ship Missiles (SSM) and the U.S. Army High Mobility Artillery Rocket System (HIMARS) to conduct a live fire and comprehensive exercise,” said Kaida. “Alliances with partner nations are a key element to secure our regional stability and enhance our capabilities of deterrence and response in the Indo-Pacific region.”

From the air, U.S. Navy F/A-18F Super Hornets assigned to Fighter Attack Squadron 41 shot a long range anti-ship missile. U.S. Army AH-64 Apache helicopters shot air-to-ground Hellfire missiles, rockets, and 30mm guns. U.S. Marine Corps F/A-18C/D Hornets assigned to Marine Fighter Attack Squadron 232, Marine Air-Ground Task Force 7, fired an air-launched cruise missile, air-to-surface anti-radiation missiles, an air-to-ground anti-radiation missile, and joint direct attack munitions.

Royal Canadian Air Force Brigadier-General Mark Goulden, commander of the RIMPAC Combined Force Air Component Command, is responsible for operations in the air domain across the exercise and discussed the challenges of a SINKEX and amount of teamwork involved to successfully complete the mission.

“SINKEX is more than the end result. It takes a team of capable, adaptive partners from different nations and disciplines to come together to find, fix, track, target, engage and assess with the agility and precision required to put the right ordnance in the right place, at the right time, every time,“ said Goulden. “The SINKEXs at RIMPAC provide us with a uniquely complex and challenging environment for partner forces to hone those important skills. Being able to work together was our goal, and SINKEX is a demonstration of our success.”

U.S. Marine Corps Forces, Pacific Deputy Commander Brig. Gen. Joseph R. Clearfield serves as the Fleet Marine Force Commanding General oversees all Marine Corps Forces assigned to RIMPAC.

"The role of Marine Corps aircraft, alongside forces from our partners and allies in this SINKEX, is an awesome display of the versatile combat power the combined force brings to the fight," said Clearfield. "It was a bittersweet moment for me, having served aboard USS Denver during my career. But what a way for her to go out! This exercise shows the power of partnerships in the region."

Finally, from the sea, U.S. Navy guided-missile destroyer USS Chaffee (DDG 90) shot its Mark 45 5-inch gun.

Former Navy vessels used in SINKEXs are prepared in strict compliance with regulations prescribed and enforced by the Environmental Protection Agency under a general permit the Navy holds pursuant to the Marine Protection, Research and Sanctuaries Act. Each SINKEX is required to sink the hulk in at least 1,000 fathoms (6,000 feet) of water and at least 50 nautical miles from land. Surveys are conducted to ensure that humans and marine mammals are not in an area where they could be harmed during the event.

Prior to the vessel being transported for participation in a SINKEX, each vessel is put through a rigorous cleaning process, including the removal of all polychlorinated biphenyls (PCBs), transformers and large capacitors, all small capacitors to the greatest extent practical, trash, floatable materials, mercury or fluorocarbon-containing materials and readily detachable solid PCB items. Petroleum is also cleaned from tanks, piping and reservoirs.

Ex-Denver, the third U.S. Navy ship to bear the name of American pioneer James William Denver and the capital of the state of Colorado, was commissioned Oct. 26, 1968. Over its history, the ship played a significant role in several operations, most notably Operation Frequent Wind, the evacuation of Saigon, Vietnam in April 1975. The ship was decommissioned as the oldest deployable warship in the Navy after 46 years of service at Joint Base Pearl Harbor-Hickam Aug. 14, 2014.

Twenty-six nations, 38 ships, three submarines, more than 170 aircraft, more than 30 unmanned systems and 25,000 personnel are participating in RIMPAC from June 29 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world’s largest international maritime exercise, RIMPAC provides a unique training opportunity while fostering and sustaining cooperative relationships among participants critical to ensuring the safety of sea lanes and security on the world’s oceans. RIMPAC 2022 is the 28th exercise in the series that began in 1971.

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