Some 25,000 sailors and other military personnel from 22 nations are converging on Hawaii starting Friday to practice hunting for submarines and catching pirates in the world's largest naval exercises.
The U.S. Pacific Fleet is hosting the Rim of the Pacific exercises, which take place every two years in Hawaii and surrounding waters.
Countries from Japan to Tonga and Russia to Chile are sending 42 surface ships, six submarines and 200 aircraft to participate in the series of drills, which takes place over the next five weeks.
Participants will train to clear mines, dispose of explosives and come to the aid of civilians in natural disasters, among other drills.
Adm. Cecil Haney, the Pacific Fleet commander, said the drills help different nations prepare for emergencies.
"It provides an opportunity for naval forces of like-minded countries to work together so that as things come up, we can more easily assemble and address things like humanitarian assistance, disaster relief," Haney told The Associated Press during a recent interview at his Pearl Harbor headquarters.
The exercises, known as RIMPAC, date to 1971 but have expanded in recent years. Eight nations took part in 2006, 10 in 2008, and 14 two years ago.
This year's exercises come as the U.S. refocuses its attention on the Asia-Pacific region.
In January, the Obama administration announced a new defense strategy to boost the country's presence in Asia because of the region's economic importance and China's rise as a military power. It aims to maintain American military pre-eminence worldwide even as the U.S. cuts spending to reduce the nation's deficit.
As part of that strategy, Defense Secretary Leon Panetta earlier this month told a conference in Singapore the U.S. would assign 60 percent of its fleet to the Pacific Ocean by 2020. Currently, the Navy divides its roughly 285 ships equally between the Atlantic and Pacific oceans.
Ralph Cossa, president of the Pacific Forum Center for Strategic & International Studies, a Honolulu-based think tank, said the drills show Panetta and the U.S. Pacific Command â€" which oversees all American forces in the region â€" are serious when they say readiness in the Pacific won't be affected by defense drawdowns.
"What better way to prove that than holding the world's largest maritime exercise," Cossa said. "That's putting your money and your ships where you mouth is."
One new part of the drills is the use of a cooking oil and algae biofuel blend to power some of the U.S. vessels and aircraft. The Navy is spending $12 million to buy 425,000 gallons of biofuel for the exercises.
It's part of an effort to demonstrate the Navy can use biofuels to reduce its consumption of fossil fuels. The Navy has been investing heavily in technologies for algae, sugar and other crops so that biofuels will meet half of its fuel needs by 2020.
The exercises end Aug. 3.
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