The Modular Integrated Communications Helmet (MICH) is a combat helmet and one of several used by the U.S. military. The shape was developed by the United States Army Soldier Systems Center to be the next generation of protective combat helmets for use by the U.S. Army.
It is used for
Head protection when parachuting for military paratroopers
Head protection from bumping objects for military ground forces
Head protection against handgun rounds and ballistic fragments, stops a 9mm bullet from a machine gun.