What is the primary purpose of the chemical protective over-garment?

The primary purpose of the chemical protective over-garment is to provide protection against hazardous materials. These garments are specifically designed to shield the wearer from chemical agents, biological threats, and radiological contaminants that may be encountered in combat or hazardous environments. The fabric and materials used in these garments are engineered to resist penetration by toxic substances, offering a vital layer of defense to personnel that helps maintain safety and operability in contaminated conditions.

While insulation against heat, durability, and waterproofing are valuable features in military clothing, they do not represent the primary function of chemical protective over-garments. The focus of these garments is specifically on safeguarding service members from chemical threats, which makes option C the most accurate choice regarding their essential purpose.