There's a posibility that I misunderstood what you need, but: Can you not use some strategy computer games as a simulated environment? (I realize they're not realistic, but that might not be a problem in some cases)

For example, StarCraft: Brood War has an API that you can use to create an agent that controls all the military units in-game. You could take a look at this event - it's a tournament of AI agents playing StarCraft (there's also a link to tutorial): http://sscaitournament.com/