Prepping for Slingload Marines prepare to attach an M777 howitzer to a CH-53E Super Stallion helicopter during integrated slingload training at Marine Corps Base Camp Pendleton, Calif., April 12, 2017. Marine Corps photo by Cpl. Frank Cordoba SHARE IMAGE: Download Image: Full Size (1.41 MB) Tags: Ch-53E Super Stallion, slingload training, M777 HOWITZER, training, MARINE CORPS, MARINES Photo By: Cpl. Frank Cordoba VIRIN: 170412-M-DJ953-0260A.JPG Photo Gallery