11th Armored Cavalry Regiment Baseball Cap Black Horse 11th ACR Hat Mens 11th Armored Cavalry black cap and Bumper Sticker by Buy Caps and Hats. The Black Horse on the Bill. 11th AC patch with shadow design of it on the side. Quality embroidered cap with low profile for a streamlined look. 11th Armored on the back strap. Durable fabric that resists fading, stains and moths.