Airborne!

From a technology standpoint, Airborne! was a somewhat pioneering game as it
was the first Mac game to use digitized sound (most notably for the symphonic
rendition of “Ride Of The Valkyries” during the opening screen), but gameplay-
wise, it’s essentially an adaptation of Paratrooper. You control a single
person who, using both an antiaircraft gun and a mortar gun, must ward off
waves of helicopters (and occasionally other aircraft) dropping paratroopers
to come and blow up your gun station.

Airborne!