Understanding War Policy

Just to make you aware of how little I understand the Afghanistan war policy, I do not understand how the following two facts are related. First is that Karzai is becoming more and more insistent that we scale back on the aggressiveness of our military activity in that country. Second is that we are deploying M1A1 Abrams tanks to that war for the first time since the war began. I'm sure you understand that, but in my stupidity, I do not.