Operation Lighthouse Keeper
You’ll have to deal with a lot of UAVs in this mission so use a fighter/multirole with dogfighting parameters (speed, mobility, air-to-air rating) that can use QAAM or SASMs. Multi-target AA SP weapons won’t be able to much of help here since the drones will most likely engage your allied planes in close quarters combat.
For the first part of the mission, you have to fly low and navigate through the radar bubbles around the operation area. The lower you fly, the better space you’ll have to navigate through the restricted zones. Continue switching your radar mode to know which part of the radar bubble to take to reach the space elevator.
After passing through the radar zone, you can now head to the space elevator and clear all AA emplacements there. After clearing the zone, more offshore targets will appear in the city. Fly there and destroy all container boxes to stop them from launching more drones. Destroy the ground targets and the drones launched from containers earlier then head back to the space elevator.
More drones will appear so engage them and destroy as many as you can. Like before, the easiest ones to shoot down are those actively engaged with friendlies. Use them as bait (including Mother Goose One) so you can get behind the drones and shoot them out of the sky. Continue shooting down drones until the timer runs out. Mission complete.
Completing this will unlock the MiG-21bis and F-104C Starfighter
Florent Noilet “RONIN”
A plane with good speed and stability will make completing this condition easier. Fly below 200 meters and get past the anti-air network until you reach the space elevator. Destroy all AA installations surrounding the space elevator and wait for the cutscene where your allied forces arrive via chopper. Ronin will appear appear in the northeast portion of the map after the cutscene, heading west. More details here.
To get an S rank, clear the first phase of the mission as fast as you can and destroy the offshore targets. During the second part of the mission, you’ll have to shoot down as many UAVs as you can since the mission will automatically end when the countdown is almost done. (Shooting down the ace is optional since shooting more UAVs will pad up your score better)