This Shellback Ancient Order Of The Deep Military Patch was designed for those that crossed the equatorial line and went from Pollywog to Trusty Shellback. A tradition found among the Sailors and Marines of the US Military. This Shellback patch measures 5 inches and is fully embroidered with a heat seal backing. The design featured on this military patch is the original military art of Devildogshirts.Com. Welcome to the Court of Neptune Rex and the Ancient Order Of The Deep!