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The last major U.S. military aircraft incident occurred in May when an Air National Guard C-130 cargo plane crashed outside Savannah, killing all nine personnel on board. A recent investigation determined that crash was due in part to pilot error.

Late Wednesday, the Marines released the investigation into another deadly crash – a KC-130 that went down n Leflore County, Mississippi in August 2017, killing 15 Marines and 1 sailor on board.

It found that a propeller became dislodged and went into the aircraft's fuselage.

\"The investigation determined that the aircraft's propeller did not receive proper depot-level maintenance during its last overhaul in September 2011, which missed corrosion that may have contributed to the propeller blade liberating in-flight,\" a press release from the Marines said.

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