Matthew Zimmerman became the new head of Project Director Joint Services during a vitural change of leadership ceremony on June 16, replacing Col. Justin Highley. PD Joint Services integrates the Single Manager for Conventional Ammunition mission, providing the warfighter with conventional ammunition required to train and go to war.The organization is part of the Joint Program Executive Office Armaments and Ammunition, based at Picatinny Arsenal. U.S. Army Photo by Jesse Glass.