Allright this is what I know so far. Apparently from my research so far, this helmet is an early ww1 era british helmet.
The war office started development of two prototypes: the first model Type A and the second model, Type B.
I believe I have a Type B helmet based on the rim mesurements. A Type A helmet had a rim that mesured 50mm at the sides and 40 mm at the front.
Where as my helmet has a rim mesuring 25 mm at the front and back and 35 mm at the sides. Consistent with the Type B helmet design.
I guess the question im asking is if anyone has any information about the insignia painted on the front( if im correct that its the 36th "Texas" Division).
Also any other information on the helmet, I was told it was very rare to have "this type of helmet" with an American insignia painted on it. Because of the fact that it was an early prototype used mainly by British Forces in france and that there was only a limited amount of American soldiers in France at that period of the war. Im not very sure if im correct on this or not.
Here is a pictures of the helmet
And also here is the link to the page were I cited all the information I have on the helmet so far.
That is indeed the 36th Division crest that they use even until today the T for Texas and the Arrowhead for Oklahoma, although the Okies got kicked out after WW1. Your helmet was used after 1917 because the division was called the 15th before July 1917. The 36th went away after WW2 but was recently reactivated from the 49th AD and remains an all National Guard Texas unit.