I encouraged all my subordinate commanders and staff to feel free to argue with me. My guidance was simple: "Disagree with me, do it with feeling, try to convince me you are right and I am about to go down the wrong path. You owe that to me; that's why you are here. But don't be intimidated when I argue back. A moment will come when I have heard enough and I make a decisions. At the very instant, I expect all of you to execute my decision as it if were your idea. Don't damn the decision with faint praise, don't mumble under breath -- we now all move out together to get the job done. And don't argue with my anymore unless you have new information or I realize I goofed and come back to you. Loyalty is disagreeing strongly, and loyalty is executing faithfully. The decision is not about you or your ego; it is about gathering all the information, analyzing it, and trying to get the right answer. I still love you, so get mad and get over it.
From "It Worked For Me" by Colin Powell