Misc. Publications Multi-part Series Development of the M1 Helmet Liner Author:Merritt C. Pratt, Lt. Col, QMC. Retd. Published:Throughout Lt. Col Pratt's service and civilian work. Development of the M1 Helmet Liner Chapter I Chapter II Chapter III Chapter IV Chapter V Chapter VI Appendix I Appendix II Appendix III Appendix IV Appendix V Appendix VI Summary