Do people in the military use a flare gun?

Answer 1

Are there flare guns in the military? Yes. The most common places you'd find the hand held kind would probably the Coast Guard, Navy, and auxiliaries such as the Merchant Marine and Civil Air Patrol. In the Army, if we ever used them, it was typically Star Clusters fired from an M203 tube, but the advances in night vision technology have more or less eliminated the need for flares. I'd imagine it would be more the same for the Marines.

Answer 2

The military uses aerial flares for signaling. The flares may be fired from a flare gun, or from a hand held launcher.