Today, Fort Indiantown Gap is home to the headquarters of the Pennsylvania Department of Military and Veterans Affairs and the Pennsylvania National Guard as well as numerous tenant organizations. It is one of the busiest National Guard Training Centers in the country, with more than 100,000 personnel training there annually, including reserve-component and active-duty service members and law-enforcement officers. Muir Army Airfield, which is home to the 28th Expeditionary Combat Aviation Brigade and the Eastern Army National Guard Training Site, is one of the busiest airfields in the U.S. Army. Since the September 11th attacks, the Gap has served as a mobilization center for troops supporting operations in Bosnia and Kosovo, as well as operations Enduring Freedom and Iraqi Freedom.