ADF-01 Codename 'FALKEN' is an Advanced Defense Fighter equipped with TLS [Tactical Laser System] below its cockpit , deals heavy damage to target and has very long distance of firing range.
In Ace Combat 5 , player can purchase it after destroying all FALKEN Hangar in some mission.
You can find the Hangar in mission 12A , 12B , 16A , 16B , 27 You should hear this message from the AWACS, "Mechanical parts discovered, and destroyed facility. We'll have the ground forces retrieve them later." After Destroying the correct Hangar , and this message inform the player that the parts had been obtained.