The First Troop Philadelphia City Cavalry, also known as the First City Troop, is a unit of the Pennsylvania Army National Guard. It is one of the oldest military units in the United States still in active service and is among the most decorated units in the U.S. Army. Accordingly, the Troop operates under a number of principles of self-governance unique in the U.S. military, including the election of unit members and officers, voluntarily forgoing pay for military service to the country, continuing to practice horse cavalry skills and tactics, and recruiting a high percentage of its members from veterans of prior active duty service across all branches (many of whom resign past officer commissions to join), as well as older civilian mid-career professionals.