MV-22B Ospreys cover and align on the flight deck of the USS Essex during Composite Training Unit Exercise March 18, 2015.<br>Elize McKelvey/U.S. Marine Corps

Report: Pilots at fault in Osprey crash that killed 2 Marines in May

An investigation has determined an Osprey crash that killed two Marines in May at Marine Corps Training Area Bellows on Oahu was mainly due to pilot performance and an improper site survey of the terrain.