Abstract: An alignment tool for fitting a helmet to a wearer's hear and aligning helmet mounted visual display systems to the wearer's eyes in a reproducible manner. The alignment tool includes latch points that are connected to corresponding connection points on the helmet. These connection points are also the connection points for the helmet mounted visual display systems. The alignment tool allows for accurate measurement, alignment and fitting of the helmet to the wearers head based on the special relationship between the connection points and the wearer's eye. Once the helmet is fitted using the alignment tool, the helmet mounted visual display systems are connected to the helmet connection points and the wearer's eyes are substantially aligned for use with the visual display system.

Abstract: An interchangeable latch system for configuring a custom fitted inner helmet as a standard platform for mounting different outer helmets thereon. The latch system includes a pair of strikers mounted onto temple panels of the inner helmet and tracks or channel assemblies mounted onto facing inner surfaces of the outer helmet. A fitting fixture may be used to custom fit the inner helmet so that the strikers are located at a preset distance and orientation from the wearer's eyes. For outer helmets equipped with helmet mounted displays, the display may be distanced and oriented from the tracks based on the known striker-to-eye distance, to establish a desired viewing distance.

Abstract: An interchangeable latch system for configuring a custom fitted inner helmet as a standard platform for mounting different outer helmets thereon. The latch system includes a pair of strikers mounted onto temple panels of the inner helmet and tracks or channel assemblies mounted onto facing inner surfaces of the outer helmet. A fitting fixture may be used to custom fit the inner helmet so that the strikers are located at a preset distance and orientation from the wearer's eyes. For outer helmets equipped with helmet mounted displays, the display may be distanced and oriented from the tracks based on the known striker-to-eye distance, to establish a desired viewing distance.

Abstract: An individually fitted helmet liner includes a plurality of superposed contacting layers, each of which consists of a thermoplastic sheet formed with an array of pockets which are open and unfilled to allow their deformation in response to compressive contact with an adjacent layer. The liner is fitted to an individual wearer's head by heating the sheets to a plastic state, placing the liner between an outer shell and the wearer's head, and pressing down on the outer shell to deform the sheets to the proper extent.