The Klingon Defense Force (KDF) was the military force of the Klingon Empire.
It held overall command of all Klingon ships and could override orders given to any House's ships.
It stayed neutral during the Klingon Civil War, keeping order on the Empire's worlds and its borders secure. It preferred to let the Houses fight amongst themselves for Chancellorship succession.
As of 2373, its headquarters had been relocated to Ty'Gokor. At the end of the Dominion War, it received orders to return to Qo'nos as Chancellor Martok had a victory drink on Cardassia Prime's surface.