WASHINGTON — After a spate of deadly accidents that have claimed the lives of 20 service members in the past four years, a Navy report acknowledges that the military failed to address a growing series of issues with the V-22 Osprey aircraft since it took flight almost 20 years ago.

“The cumulative risk posture of the V-22 platform has been growing since initial fielding,” according to the report by Naval Air Systems Command released Friday. It added that the office in charge of the aircraft “has not promptly implemented … fixes to mitigate existing risks.”

“As a result, risks continue to accumulate,” the report said.

The Associated Press reported last year that the most serious types of accidents for the Osprey, which is the only aircraft to fly like a plane but convert to land like a h

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