1st Combat Engineer Battalion, 1st Marine Division prepares for and executes an obstacle in Steel Knight (SK) 2019 at Marine Corps Air Ground Combat Center, Twentynine Palms, California, Nov. 28, 2018. SK is an annual exercise used to showcase the Marines and Sailors skills, tactics, and combat readiness by performing in various dynamic scenarios, ground combat maneuver operations, and live fire ranges. (U.S. Marine Corps video by Lance Cpl. Jack C. Howell.)