I used bombers to take out all defense of an enemy city. Then I tried to air drop some parachuters into the city (it was on another continent). I tried maybe 8 air drops and every time I got "air drop failed". Then I tried the same thing on a nonoccupied enemy square with radar tower. Same result --- all air drops failed. Does this always happen on enemy city/radar tower squares or was I just extremely unlucky?? If you can't air drop into enemy cities and your parachuters have no extra move after they have air dropped, they seem quite useless to me. Another thing...helicopters...does anyone ever use them?? They seem even more worthless...