This 2021 Nike Space Force Black SS jersey is officially game issued by the U.S. Air Force Academy, size large, number 31. SS stands for Semper Supra, the official march of the United States Space Force. Representing the 2021 football season, this jersey is a collectible celebrating academy football and Space Force heritage. To ensure its legitimacy and long-term value, this item is authenticated by The U.S. Air Force Academy and CollectibleXchange partnership and includes its official certificate of authenticity.