MV-22 Ospreys and KC-130J Hercules are parked during Marine Rotational Force - Darwin trans-Pacific flight, Cassidy International Airport, Kiribati, Sep. 19, 2019. The flight was conducted to improve upon the Osprey trans-Pacific concept that has been developed and refined over the past three MRF-D iterations. - MV-22 Ospreys and KC-130J Hercules are parked during Marine Rotational Force - Darwin trans-Pacific flight, Cassidy International Airport, Kiribati, Sep. 19, 2019. The flight was conducted to improve upon the Osprey trans-Pacific concept that has been developed and refined over the past three MRF-D iterations.

Marines with Marine Medium Tiltrotor Squadron 363 perform post-flight checks on an MV-22B Osprey after an aerial refueling training event at Marine Corps Air Station Miramar, California, Dec. 16. The squadron conducts this annual training once every two months to maintain their proficiency with the maneuvers. - Marines with Marine Medium Tiltrotor Squadron 363 perform post-flight checks on an MV-22B Osprey after an aerial refueling training event at Marine Corps Air Station Miramar, California, Dec. 16. The squadron conducts this annual training once every two months to maintain their proficiency with the maneuvers.