Military investigators concluded that mistakes made in 2011 caused the crash.
The report found there was nothing the crew could have done that would have prevented the crash.
The Marine Corps Reserve plane was en route to California before it crashed into Mississippi farmland, killing 15 Marines and a U.S. Navy sailor
Without warning tragedy struck at 20,000 feet.
The newly released investigation findings by the 4th Marine Aircraft Wing said the plane experienced catastrophic failure.
Military investigators say a blade on the left inboard propeller of the KC-130 flew off and sliced through the fuselage.
Wreckage from the July 2017 military plane crash was strewn for miles across a Mississippi soy bean field.
A year-and-a-half later, the military investigation report blames the accident on faulty work done at Robins Air Force Base in Georgia.
Tiny pits of corrosion which turned into a crack caused the first blade to fail, corrosion that should have been detected if the inspection had been completed properly according to the report.
It also states in 2011, employees missed growing corrosion on the key propeller blade during an overhaul at Robins Air Force Base.
Since the crash the report from the states Air Force has adopted the Navy's more demanding overhaul procedures for all propellers.
Along a county road in Leflore County, Mississippi, a patriotic cross marks the site of the crash, paying tribute to the 16 men who died in the line of duty. This report also makes 17 recommendations to prevent another similar mishap which include changes in maintenance procedures and record keeping.