What type of ordnance includes devices designed to produce illumination or incendiary effects?

The selection of pyrotechnics as the correct answer is based on the specific characteristics and intended uses of this category of ordnance. Pyrotechnics are specially designed devices that generate visible light and heat, primarily for illumination purposes during operations. This category includes flares, signaling devices, and other similar items that can create bright flashes or provide light in dark environments.

Furthermore, while incendiaries specifically refer to devices meant to ignite fires or cause damage through combustion, pyrotechnics encompass a wider range of light-producing devices, both for safety and tactical applications. Explosive ordnance, on the other hand, generally refers to devices designed to detonate or explode, which may not necessarily focus on illumination. Firearms are weapons designed to shoot projectiles, and they do not fall within the realm of devices for illumination or incendiary effects. Thus, pyrotechnics is the most accurate term to describe devices crafted for these specific functions.