The US Navy found that the F-18 fighter jet that tipped off the flight deck of the USS Harry S. Truman aircraft carrier on May 6 was caused by limited knowledge, insufficient training, and combat conditions contributing to a strained environment, the navy announced on Thursday.While the jet was lost due to the failure of an arresting wire, the navy found that the wire failed due to inadequate maintenance practices, limited knowledge, low manning levels, and a high operational tempo.No injuries