The official on-field cap of Armed Forces Weekend is here at MLB Shop! Grab one of the new Mariners 2021 Armed Forces Day hats to honor our service members and show your support for your favorite team at the same time. You can also add to your game day wardrobe with a pair of trendy Seattle Mariners Armed Forces Day Stance socks. Browse the whole collection to find Seattle Mariners Armed Forces Day merchandise and gear perfect for your or a fellow fan. When you shop the Armed Forces Day On-Field Authentic Collection, Major League Baseball will donate its licensed royalties from the sale of Mariners Armed Forces Day apparel to MLB charities to support programs for service members, veterans and military families.