A U.S. Marine with Scout Sniper Platoon, 1st Battalion,

A U.S. Marine with Scout Sniper Platoon, 1st Battalion, 8th Marine Regiment sketches the layout of the buildings before him and notes key pieces of information so that if a shooter has to be replaced, another member in the group can continue the mission without any variations during Integrated Training Exercise 1-16 aboard Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Oct. 24, 2015. Marines participate in a month-long field exercise demonstrating core mission essential tasks by conducting offensive, defensive and stability operations using combined arms, air integration, and battalion-level infantry tactics in order to strengthen operational readiness as they prepare for world-wide deployment. (U.S. Marine Corps photo by Cpl. Kelly L. Street, 2D MARDIV COMCAM/Released)