Which environmental factors can degrade munitions over time?

• A. Temperature fluctuations and humidity only.
• B. Moisture alone.
• C. Corrosion alone.
• D. Temperature fluctuations, humidity, moisture, and corrosion.

Answer: (D)

Environmental effects on munitions come from how materials respond to temperature, humidity, moisture, and corrosion. Temperature fluctuations cause parts to expand and contract. Over time this mechanical stress can crack seals, gaskets, or binders in propellants and primers, and it can also drive condensation that introduces moisture. Humidity and moisture directly promote chemical and physical deterioration: moisture can seep into packaging and metal surfaces, accelerating chemical reactions in the explosive formulations and lubricants, and it makes metal components more susceptible to corrosion. Corrosion itself weakens metal casings, casings, fuzes, and connectors by thinning walls, causing pitting, or degrading critical joints, which can compromise safety and function. These factors don’t act in isolation—their effects compound. Temperature swings can drive moisture ingress; moisture accelerates corrosion; corrosion worsens the damage caused by humidity and temperature cycling. Because all four factors contribute to degradation, the option that includes temperature fluctuations, humidity, moisture, and corrosion best describes the environmental risks to munitions over time.