Original Rare U.S. 1950s Era Experimental X51 "Universal Helmet" Liner with Intact Rigging - Size Small French Awards Medals Badges Insignia By 1941 it was replaced

By 1941 it was replaced by other types and found new uses with ground troops

Guiteau was reportedly furious that Garfield overlooked him for appointment to a federal post and vowed to take vengeance on the President - and to do so with a good-looking gun

Both are cracked through the center

It is marked ROCK ISLAND ARSENAL along with an inspection mark

Aviation Section propeller insignia collar tab and well as correct U

Original Rare U.S. 1950s Era Experimental X51 "Universal Helmet" Liner with Intact Rigging - Size Small French Awards Medals Badges Insignia By 1941 it was replacedOriginal Item: Only One Available. Well these are RARE!!! There isn't much information out there at all about the X51 helmets, which were developed and tested during the 1950s. They were seen as an attempt to use new technology to improve upon the M1 helmet, which had served the U. S. Military well during WWII. Also with the post war budget cuts, they looked to create a "Universal Helmet", which would be able to meet the needs of all service members.