Have you seen
Heli Rescue? It looks like being a good freeware program. "Your friends have all been imprisoned inside 3 enemy bases. Each one of these bases holds 4 of your comrades. You must hit these bases with your rockets to let them escape. If you make a direct hit on a base, The men will run out. You must then pick them up by landing near to them. Don't stay on the ground for too long or a tank will find you.
When you have picked up some men fly them back to your helicopter pad, Where they will be safe."
