An investigation is underway after a U.S. military Osprey aircraft crashed during a weekend training exercise in Hawaii, killing a Marine and injuring 21 others.
Here are some things to know about the Osprey:
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HELICOPTER OR PLANE?
It's actually both. The Osprey is a tilt-rotor aircraft, which means its propellers can be adjusted to fly either vertically or horizontally. That allows it to take off and land vertically like a helicopter, but it also flies like a fixed wing airplane.
It can reach up to 277 mph and 25,000 feet, making it ideal for long-range missions.
Ospreys are used by the Marines and Air Force, and have been deployed to the wars in Iraq and Afghanistan.
The Air Force's website says the aircraft's primary mission is "special operations forces long-range infiltration, exfiltration and resupply."
Some Ospreys are involved in humanitarian work, such as assisting earthquake relief efforts in Nepal. The aircraft also have been used to deliver supplies to those fighting Ebola in Liberia, and aid to typhoon victims in the Philippines.
The Osprey program was nearly scrapped after a history of mechanical failures and deadly crashes. Boeing Co. and Bell, a unit of Textron Inc., build the aircraft.
There were two crashes of its early version, in 1991 and 1992. Seven people died in the second wreck.
In 2000, two test crashes killed 23 marines. In 2010, three service members and a civilian contractor were killed in a wreck of the Air Force version of the aircraft.
The military maintains Ospreys are safe, and the Hawaii training exercises were not cancelled after the crash.
Sunday's wreck has renewed concerns about the Osprey in Japan, where more of the aircraft are to be deployed. Okinawa's governor called for all flights to be suspended there until the Hawaii crash is investigated.
The U.S. military already has 24 Ospreys on Okinawa, and last week said 10 more would be stationed at Yokota Air Base near Tokyo, starting in 2017.
In addition, Japan's Defense Ministry plans to buy 17 Ospreys from the U.S. government.
Associated Press writers Mari Yamaguchhi in Tokyo and Mark Thiessen in Anchorage, Alaska, contributed to this report.