The Defense Video & Imagery Distribution System produced the video above and describes it like this:
Video story of Marines from Battery K, 3rd Battalion, 12th Marine Regiment, attached to 2nd Battalion, 11th Marine Regiment, who recently concluded the first West Coast training with the M327 120mm Expeditionary Fire Support System with live-fire exercises at various ranges in preparation for a deployment with a Marine Expeditionary Unit this fall. Includes sound bites from Staff Sgt. Javier J. Valdez, Marine Detachment Fort Sill Instructor and Lance Cpl. Tracy Strickland, Cannoneer, Battery K, 3/12.