Lance Cpl. Benjamin Strube, a scout observer with Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, sketches distant mountainous during an air assault course for Company A, 1st Battalion, 23rd Marine Regiment, 4th MARDIV, during Integrated Training Exercise 4-18, aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 17, 2018. ITX 4-18 provides Marine Air-Ground Task Force elements an opportunity to undergo service-level competency assessments so that they can seamlessly integrate with active duty Marines in the event of a crises that requires a rapid response. (U.S. Marine Corps photo by Cpl. Dallas Johnson/Released)