What is the purpose of the insulation required for jettison lockers containing incendiary ammunition?

The purpose of the insulation required for jettison lockers containing incendiary ammunition is to reduce fire hazards. Incendiary ammunition poses significant risks since it can ignite and cause a fire if exposed to heat or flames. Insulation serves to create a barrier that minimizes the transfer of heat, thereby decreasing the likelihood of ignition and subsequent fire incidents. By effectively insulating the lockers, the design ensures that any heat generated or introduced into the locker does not reach a level that could ignite the ammunition inside. This is a critical safety measure on aircraft carriers, where flammable materials are present, and the risk of fire needs to be meticulously managed to protect personnel and equipment.

The other choices, while relevant in the context of safety and security, do not specifically address the primary reason for insulation requirements in the context of incendiary ammunition storage. Unauthorized access addresses security concerns, structural integrity relates to the physical design of the lockers, and temperature control, while important in some contexts, does not specifically link to the fire hazard reduction as directly as insulation does for incendiary ammunition.