TM 10-8400-203-23 CHAPTER 4 MAINTENANCE OF COMBAT VEHICLE CREWMAN’S HELMET Section I. INTRODUCTION This chapter provides information and instructions for the maintenance of combat vehicle crewman’s hel- mets, Models DH-132A, with Ballistic Shell, and DH–132. National stock numbers for complete helmet, Mod- el DH-132, Standard B, are as follows: NSN SIZE 8470-01-130-8180 Small with small inner liner with medium shell 8470-01-130-3794 Medium  with  medium  inner  liner  with  medium  shell 8470-01-130-3795 Large with large inner liner with large shell 4-2. TECHNICAL PUBLICATIONS I NSN SIZE FM  10-16 General Fabric Repair Change 3    4-1