Marines with Company B, 1st Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve, fire 60mm mortar rounds in support a company attack during a Mission Rehearsal Exercise aboard U.S. Army Fort A.P. Hill, Va., April 6, 2018. Along with its combat engineer battalion, combat logistics battalion, assault amphibious vehicle and artillery attachments, 1st Bn., 25th Marines, conducted a 10-drill MRX in preparation for Integrated Training Exercise 4-18. This MRX was a stepping stone in a force generation plan to ensure that once 1st Bn., 25th Marines, 1st Bn., 23rd Marines, and other ready bench units complete ITX 4-18, they will be ready to rapidly respond to a national security threat with maximum capability. (Courtesy photo provided by 1st Bn., 25th Marines)25 Marines)