Lance Cpl. John Hernandez, rifleman with Company A, 1st Battalion, 23rd Marine Regiment, 4th Marine Division, Marine Forces Reserve, provides security during a mechanized operations course during Integrated Training Exercise 4-15 aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 15, 2015. During these exercises, infantry Marines are trained to effectively move in and out of amphibian assault vehicles during combat simulations. ITX allows Reserve Marines to train in realistic environments and conditions, which reinforces maintenance of the highest levels of proficiency and readiness in preparation for worldwide deployment and the ability to work as a Marine Air Ground Task Force. (U.S Marine Corps photo by Cpl. Ian Ferro)