What type of rounds can the M119A3 fire for illumination purposes?

The M119A3 howitzer is designed primarily to fire 105mm projectile rounds, and among these rounds, specific types are utilized for various purposes, including illumination. Illumination rounds are a specialized type of projectile that is specifically created to provide light and enhance visibility in combat situations during night operations.

While high explosive and smoke rounds serve particular functions—high explosive rounds for direct combat and smoke rounds for obscuring visibility or marking locations—they do not serve the purpose of illumination in a tactical context. Guided missile rounds are not applicable as the M119A3 is not designed to fire guided munitions; it focuses on conventional artillery projectiles.

Therefore, the M119A3 fires 105mm projectile rounds specifically designed for illumination to fulfill the requirement for providing visibility and light during operations, making this choice the correct answer.