I'm not sure what you mean by "combat2000". Could you please provide more context or clarify your question? Are you referring to:

1. A specific video game or combat simulation from the year 2000?

2. A military strategy or combat tactic developed around the year 2000?

3. A movie or book title with that name?

4. Something else entirely?

If you can give me more information, I'll be better able to help you with your request.