this is my vietnam era m1 helmet. the mitchels cover and band came together on a different helmet from ww2 era. i put it on my early 70's helmet and liner to make it more original. looks like it belonged to private first class Dever. it appears to have some blood spatter stains on the side. looks like it has been sewn heavily in some areas for some reason. the cover is dated 1963. the liner ad shell came together. the liner is dated 1975- the shell is dated 1973 im guessing? this is the only one i have ever seen with yellow paint on the inside. it has a sand texture on it i beleve. ant ideas what (usch73) stand for? any one seen this marking before. any advice would be apreciated, if there is any more picks you would like let me know. thanks again guys!!