SYDNEY: The US Marine Corps Sunday called off efforts to rescue three missing service members after an American military aircraft crashed off Australia. Twenty-three personnel were quickly saved following Saturday’s incident involving a MV-22 Osprey tilt-rotor, the main assault support aircraft for the Marines. But three marines remain missing despite an air and sea search. “Operations have now shifted to recovery efforts. The next-of-kin for the three missing Marines have been notified,” US Marines based in Japan said in a statement.