The MV-22 Osprey tilt-rotor is the primary assault support aircraft for the Marines, with two engines positioned on fixed wing tips that allow it to land and take off vertically AFP PHOTO / JIJI PRESS ==JAPAN OUT== AFP/JIJI PRESS SYDNEY: The US Marine Corps said on Saturday that a major search and rescue operation was underway for three missing service members following a "mishap" involving an American military aircraft off the Australian coast. US Marines based in Japan said "search and rescue operations continue for three U.S. Marines that were aboard an MV-22 Osprey involved in a mishap off of the east coast of Australia".