Jack Hammer Marine Corps 1st Lt. Trevor S. Isbell, left, holds an air cable and Warrant Officer Adam M. James uses a jack hammer during at the Weapons and Tactics Instructor Course 2-17 while participating in an airfield damage repair exercise at Cannon Air Defense Complex, Yuma, Ariz., April 1, 2017. Isbell is a combat engineer officer, and James is an expeditionary airfield and emergency services officer. Marine Corps photo by Lance Corporal Clare J. Shaffer SHARE: Download: Full Size (1.54 MB) Tags: Marines, training, Marine Corps Credit: Lance Cpl. Clare Shaffer VIRIN: 170401-M-CD121-0239A.JPG Photo Gallery