I've done the campaign twice now, so that the second time i could conduct the missions knowing what weapons to take and what tactics to use.
The first time I did this mission, I ran with my men to the sea-side of the runway (blowing up any tanks on the way). We crawled up the slight slope next to the runway, out of sight from enemy patrols, but so that all of us could see the enemy soldiers (and were in range) . While my men were on hold fire, i gave the RPG soldiers targets (the helis), and the rest were ordered to fire at men. At this point I then noticed a V-80 in an opposite hangar I crawled to the V-80, leaving my men on the runway, and when i got spotted, ordered my men to open fire. Most of the choppers and enemy soldiers were killed, but by the time i got in the V-80, so were all of my men.
I took off in the V-80, killing anything that showed up red on the radar (including 5 Shilkas).
The second time I did this mission, I left all of my men at the truck and just crawled all the way to the hangar with the V-80 inside. Got in, took off, and again killed anything that showed up red on the radar.
Didn't take to long doing the second option, and on the next mission i had all of my men