At least 30 American troops have died in a spate of US military helicopter and tiltrotor aircraft crashes this year

• A US Air Force Osprey crashed off the coast of Japan on November 29, killing all eight Airmen aboard.
• It's the latest in a string of helicopter and tiltrotor crashes this year. 
• Seven crashes have left 30 American soldiers dead and injured over 40 more.

It's been a deadly year for US military helicopters and tiltrotor aircraft. Seven crashes around the world have so far killed at least 30 American service members and injured over 40 more.

None of these incidents occurred during combat or were the result of enemy fire; almost all took place during some sort of training mission. Two branches of the military grounded flights in response to crashes and the resulting loss of life.