When your not in combat but in game, if you press ESC then you see a tab called New Missions. If you click it, it will say Old Missions. What is the difference, and how do I get to play these other missions?
IIRC, the "Classic" missions are the original versions of the missions, while the "New" missions have tweaks. Ex. in the "Capture the Priam" mission in Tour of Duty 3, you have a wave or two of GUNs after the FRG is captured when you play the "New" mission, while the GUNs don't appear in "Classic" mode.