Vintage US Army M-51 Fishtail Parka *RARE*Rare Vintage US Army M 51 Fishtail Parka. Comes with Removable liner or not and is in Used Excellement of Good Condition. Each are different. This jacket come with and without a hood Details History: At the advent of the Korean War, The US Military needed a True Extreme Cold Weather Parka that was modular, ie removable exchangeable liner and Hood. The M 51 was created and issued to both the US Army and Marine Corps ground troops. (Fishtail name comes