- Hindustan Aeronautics Limited (HAL) is headquartered in Bangalore. - Bharat Dynamics Limited (BDL) is headquartered in Hyderabad. - Troop Comforts Limited (TCL) is headquartered in Kanpur. - Armoured Vehicles Nigam Limited (AVNL) is headquartered in Avadi, Chennai. - BDL's primary role is the manufacture of missiles and other defence equipment.