 The Fort Hood main cantonment area, otherwise referred to as Main post, holds its own airfield, Hood Army Airfield.North Fort Hood is bounded by Gatesville to the northwest.West Fort Hood, bounded by Killeen and Copperas Cove, includes Fort Hood's second airfield, Robert Gray Army Airfield, which has been expanded for civilian use (Killeen–Fort Hood Regional Airport (GRK)) and additional training areas.