strategy

Hi everyone. I am confused about the differences between strategy, operations and tactics. I think most people confused those words and that makes me confused as well. Can you define those terms?

Now that we are builiding up troops in Afganistan the war is going to turn bloody this spring and summer. It looks like we are repeating the same mistakes we made in Vietnam. What strategy can we use to defeat the taliban and al qaida? Also how many troops do you guys think we will have in...