A CH-53E Super Stallion helicopter from Marine Medium Tiltrotor Squadron (VMM) 166 (Reinforced), 3rd Marine Aircraft Wing, prepares to lift a 6,200 pound steel girder during external lift training aboard Marine Corps Air Station Miramar, Calif., Oct. 14. The squadron conducted the training to maintain proficiency in transporting external cargo. (Official Marine Corps photo by Sgt. Brian Marion/Released) - A CH-53E Super Stallion helicopter from Marine Medium Tiltrotor Squadron (VMM) 166 (Reinforced), 3rd Marine Aircraft Wing, prepares to lift a 6,200 pound steel girder during external lift training aboard Marine Corps Air Station Miramar, Calif., Oct. 14. The squadron conducted the training to maintain proficiency in transporting external cargo. (Official Marine Corps photo by Sgt. Brian Marion/Released)

Two MV-22B Ospreys with Marine Medium Tiltrotor Squadron (VMM) 166 get refueled before continuing a training exercise at the Grand Canyon, July 24. The Grand Canyon was the turning point during the exercise with VMM-166. - Two MV-22B Ospreys with Marine Medium Tiltrotor Squadron (VMM) 166 get refueled before continuing a training exercise at the Grand Canyon, July 24. The Grand Canyon was the turning point during the exercise with VMM-166.