You will get a radio message about the AI occupy a random town (with troops, tanks, Anti-air, MG posts) and you will have organize a team to take back the town with reinforcement (via chopper/trucks/humvee/tanks platoon).
Then the AI will randomly counter attack the towns where you liberated with its own air support, arty, special forces coming from choppers, trucks, tanks or troops once you take back the town. Or they might not counter attack the town you are in but go to another town.
Repeat the whole process again until X no. of towns or all the towns on the island are liberated or AI camp(s) are destroyed base on the parameter set at the beginning of the game.
I think the players going to have a great time playing for weeks until all the towns are liberated on the island, including the towns/villages on the remote islands that are defended by anti-air and MG posts defending the beach/island.