Helmet is here: http://imgur.com/a/hlfl4
My guess is WW1 but other than that I wouldn't know anything about it. The symbol looks like the keystone symbol.. what war was it from and does anyone have any more information on it? Thanks a ton.
Hi there! This looks like a "doughboy helmet" from the First World War, while the red keystone is the symbol of the United States 28th Infantry Division. A quick search on Google Images turns up similar examples. :)
28th Infantry Division - https://www.google.com/search?q=28th+infantry+division+helmet