I have a M1917 helmet from WW1 era. It has an unusual snake like pattern painted on top. I can think of only the 369th Infantry Regiment using the snake on thier motto but they used Adrian helmets during the war. Perhaps painted after the war for parades? Anyone has any idea if another unit used a snake on thier motto or DUI or have seen this pattern before? Thanks. The helmet is stamped ZA54 so it's american.