Abstract: A helmet assembly is provided including a front mount configured to attach to the front of the helmet above a brim of the helmet, a mandible for protecting a portion of the user's face, a lower edge rim mounting portion such as a halo attached along the lower edge of the helmet for securing the mandible to a helmet and providing power and data conduits. The front mount provides a center top mounting arrangement that operatively connects a center top location of the face shield to a center front mount on the helmet. The mount provides frontal bracket portions for mounting accessories. The helmet assembly provides a helmet shell with a curved shape having a surrounding reinforcing ridge. A reeling system is provided for adjusting front and lower chin straps. Other improvements in helmet assemblies are also disclosed.