Which instrument originally did not have valves and was used by military?

The instrument that originally did not have valves and was used by the military is the trumpet. The early trumpets, known as natural trumpets, were used for signaling and ceremonial purposes in military settings. They produced a limited number of notes based on the harmonic series, and the player's skill and technique were crucial to produce different pitches. Valves were later added to the trumpet to improve its versatility and allow for chromatic playing, thus expanding its musical capabilities beyond military use.