I would love to share a little strategy for the same.
Difficulty - Hard
Firstly, my pair of heroes include - All SSgts' - Czakowski, Hendry, Broadhurst (Exceptional Sniper) and Foreman.
Next, pick the men and deploy to the far end on the east and position them in line formation across the plane next to the hangars.
Now, take the jeep and destroy the plane closest to the hangar (also, keep those men under "Fire at will" ). By destroying the plane you have added extra time for the tank to appear
. Be fast and while other 3 are busy killing the enemies, you must reach to the back of the airport building (office where the flak truck is located) and immediately slow down. Make Sure Broadhurst snipes the enemy west to the building or else you do before reaching the office from the distance OTHERWISE you'll loose some precious surrender monkeys who'll come down to hunt you and killing them will make future missions tough.
Now, slowly reach to the doorway and wait on the left (where the steps begin to the roof). Pause for a moment and look out for no enemy following, in case, Shoot them.
Open the Tac map, this is important, move the other 3 men to the far end from the eyes of the tank when they appear. Once they are safe and clear from the airport
Next, make some noise by leaning to the right or increasing speed so that the enemy (surrender monkey 1) located inside the supply house appears. Shoot to either side (preferrably with MP40 and near boots or the legs with ONE SHOT at a time OR use a pistol but they never surrender or take a lot of time using pistols) immediately to surprise him and he'll wait there till eternity.
Now, there may be another officer who will come from the door across. If he does show up, do the same trick. Shoot but don't kill him with proper leaning back and forth.
Now, if you have done perfectly without killing them but scared the shit out enough for them to surrender. You now have 2 surrender monkeys
Immediately capture any one and change the disguise and SAVE!
You now have the time to proceed the mission as per your liking. I usually aim to destroy tank and than do the clean up job with the 2 surrender monkeys.
There are 4 - 5 surrender monkeys in this mission
1. The officer inside where the documents are located.
2. Inside the Supply House
3. Near to the supply house outside, the officer with the cap
4. Randomly 1-2 pilots which happens depending on how tensed the firefights turn and how fast you kill the enemies on the airport.
5. Near the sandbags closest to the building. He is a tough nut to crack. Best way is to clear the map leaving him last. After some leaning and running he surrenders.