The U.S. military fully resumed Osprey operations in Okinawa on Monday, spurring a sharp local reaction less than a week after one of the tilt-rotor transport aircraft made a crash-landing off the prefecture's coast.

The entire fleet of MV-22 aircraft in Okinawa was grounded following the incident the night of Dec. 13 in which two of the Osprey's five crew members were injured and the aircraft broke apart.

The U.S. military reiterated its position that the accident, which occurred during aerial refueling training, was not caused by any problem with the aircraft itself.