Harpoon (the original)
Still play it occasionaly and consider it my all time favorite. It's always on my hard drive. Once you learned how everything worked there was nothing else like it, directing massive real-time air and naval forces over the entire North Atlantic. I can still remember getting chills when an inbound Backfire raid of 20+ suddenly appeared on my AWACS screen from an unexpected direction while I was heavily involved with another large raid. Great stuff! Hope Harpoon 4 is as good or better.
Delta Force
Loved the online battles. Great interface.
Starcraft
A classic.
Command HQ
Remember that one? Still fun. A friend and I do it once in a while modem to modem. A simple game with great strategy elements. Another classic.
AV8B Harrier
Ahead of it's time with the combined air and ground campaign.
Yeager's Air Combat
I played that one to death.
Tanks! by Norm Kroger
Advance to contact, fire, and maneuver classic.
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Don Rose
Proud father of 6-year-old Adam. Read Adam's Story at http://drose55.tripod.com/