If fighting is sure to result in victory, then you must fight, even though the ruler forbid it; if fighting will not result in victory, then you must not fight even at the rulers bidding.The current POTUS is the same one that criticized the surge in Iraq back when a senator and had no reply when the success of same was thrown in his face. Agreeing with him over withdrawing from Iraq and Afghanistan is shaming the success of that surge, AFAIAC.
Sun Tzu, The Art Of War 10:23
Remember when we went in guns a-blazing back in 2001, with hopes of a resounding victory against the Taliban and al-Qaida? My, how things have changed in 11+ years...