CH252 helmet
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The CH252 Helmet is the standard issue helmet that the UNSC use for the Marines. It was most likely developed at the end of the year 2552 because it isn't shown in Halo: Combat Evolved.
In Halo 2, both regular Marines and ODST Helljumpers wear versions of the helmet - Marine helmets are painted green, while ODST helmets are painted black, like their combat suits, and feature a faceplate complete with HUD display. The standard helmet weighs about 3.3 pounds according to crates found in the game. Also, in Halo 2, you can shoot off their helmets. They will not pick them back up.
