The OM Tactical ACH -1 IIIA Helmet is manufactured with processing techniques to provide enhanced shell protection, at lower weight with improved comfort and mobility. The helmet shell is cut to allow for maximum compatibility with weapon optics, NVG's and gas masks with a forward edge cut that allows for optimum sight picturewithout helmet interference. The shell provides the wearer with maximum peripheral vision and no impairment. The helmet is fitted with a fully adjustable 4-Point harness system that can be released, removed and replaced in just a few minutes.