TM 3-205. The Gas Mask
TM 3-230. The horse gas mask, M4 and M5
Helmets and body armor in modern warfare
Natick Pamphlet 70-2. This is Your Ballistic Helmet
Patent 2383597 Protective helmet
Patent 4660223 Protective body armor
Patent Re.32569 Protective helmet
Patent US 6282726 B1 Protective helmet
