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The Enhanced Combat Helmet (ECH) is a United States Marine Corps–led Joint USMC-U.S. Army program to replace the combat helmets of the U.S. Army, Navy, and Marines using thermoplastics instead of the ballistic fibers used on the current generation combat helmets. The term "Enhanced Combat Helmet" was originally coined by Army Lieutenant Colonel William R. Schaffer. == Design == The ECH's profile is very similar to the Advanced Combat Helmet but is thicker. The helmet's shell is made of an ultra-high-molecular-weight polyethylene material. It must protect 35% better against small-arms fire and fragmentation than the Advanced Combat Helmet. The helmet is required to protect against certain rifle projectiles. The helmet is of the "tactical cut" type and thus offers less coverage but does enable better mobility. The helmet will be compatible with camouflage fabric helmet covers.〔 The replacement of the Advanced Combat Helmet with the Enhanced Combat Helmet has been likened to the transition from the HMMWV to the MRAP. The helmet has been shown nearly impenetrable to fragments fired by test guns. In a v50 test, guns were unable to attain the velocity required to get 50% of the fragments through a helmet. The helmet has vastly exceeded the 35% ballistic improvement requirement.〔 The helmet's design allows for the addition of devices such as communications and night-vision equipment. The Army is planning on using the existing pads used on the Advanced Combat Helmet for the ECH. A single pad that cushions the entire helmet may be developed. The ECH has a 4-point chinstrap/napestrap head retention system. The Marine/Navy and Army variants are differentiated in that the Marine/Navy version uses an X-Back retention system (called the Class I) and the Army uses the H-Back retention system (called the Class II).〔(【引用サイトリンク】url=http://www.marcorsyscom.usmc.mil/sites/pmice/IndustryInfo/APBIMay10/USMC_ECH_2010.pdf )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Enhanced Combat Helmet (United States)」の詳細全文を読む スポンサード リンク
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