Marines with Company A, 1st Battalion, 3rd Marine Regiment, set up security at Sonora Pass during Mountain Training Exercise 2-15 at the Marine Corps Mountain Warfare Training Center, March 23, 2015. (Official Marine Corps photo by Cpl. Charles Santamaria/Released) - Marines with Company A, 1st Battalion, 3rd Marine Regiment, set up security at Sonora Pass during Mountain Training Exercise 2-15 at the Marine Corps Mountain Warfare Training Center, March 23, 2015. (Official Marine Corps photo by Cpl. Charles Santamaria/Released)

2nd Lt. Brett Woolard, student, Infantry Officers Course 2-15, posts security atop a building during exercise Talon Reach V at Range 220, March 27, 2015. Talon Reach is a culminating exercise that reinforces Marine Air Ground Task Force operations, introduces air assault planning considerations while leveraging innovative technology. (Official Marine Corps photo by Lance Cpl. Thomas Mudd/ Released) - 2nd Lt. Brett Woolard, student, Infantry Officers Course 2-15, posts security atop a building during exercise Talon Reach V at Range 220, March 27, 2015. Talon Reach is a culminating exercise that reinforces Marine Air Ground Task Force operations, introduces air assault planning considerations while leveraging innovative technology. (Official Marine Corps photo by Lance Cpl. Thomas Mudd/ Released)