title: Service life analysis of the sPH-4 aviator helmet.
mesh_terms: D000060:Accidents, Aviation / Q000517:prevention & control*; D005069:Evaluation Studies as Topic; D006077:Government Agencies; D006260:Head Protective Devices / Q000592:standards*; D006801:Humans; D011482:Protective Devices / Q000592:standards*; D014481:United States