A tank won't waste time trying to impress you. They could care less how you think or feel. They want action. To deal with tanks effectively, understand their need for urgency and show them you are on the same side. Try repeating their exact words.
Assertiveness is important because they are assertive.
They appreciate assertive behavior if it is directed towards their goal. These people are not focused, but they are controlling. They are dangerous because think they know it all. Be certain of your facts when dealing with them and avoid confrontation over facts. Gently, steer the conversation where you want it to go.