DGA Essais en vol’s Cazaux site at Air Base 120 is an operational French state flight-test centre. It supports the development, qualification and acceptance of state aircraft and airborne systems, with flight-test specialists, instrumented aircraft, telemetry and mission-safety expertise; current DGA reporting documents helicopter, anti-drone and guided-weapon trials at Cazaux. This is a controlled military airfield and test site, not a general visitor attraction; no public visitor programme is published, so access requires authorization.