'Long Line' The Marine Corps Silent Drill Platoon practices “long line,” a part of its drill routine, during training as a part of the Marine Corps Battle Color Detachment at Marine Corps Air Station Yuma, Ariz., Feb. 8, 2017. Marine Corps photo by Cpl. Robert Knapp SHARE: Download: Full Size (1.06 MB) Credit: Cpl. Robert Knapp VIRIN: 170208-M-RU248-009C.JPG Photo Gallery