Marines with 4th Air Naval Gunfire Liaison Company, Force Headquarters Group, Marine Forces Reserve, participate in their final exercise for the Joint Fires Observer primer course at Avon Park Air Force Range in Avon Park, Florida, Aug. 11, 2017. The JFO primer course, the first of its kinda for MARFORRES ANGLICO Marines, focused on giving students pertinent and practical information for when they attend the actual course.