Very rare.
7th Squadron (Air), 1st Cavalry was a self-contained Vietnam-era air cavalry squadron, made up of 5 troops. Headquarters and Headquarters Troop (callsign Kingbird/Blackhawk), Alpha Troop (callsign Apache), Bravo Troop (callsign Dutch Master), Charlie Troop (callsign Sand Piper/Comanche) and Delta Troop (Powder Valley/Dragoon).