Shepard would rather go through the motions of proving herself, anyway. Even if it was disappointing, she wasn't from here, so her commander rank wasn't either. She-- would have to adjust her introduction. She stood straighter and saluted, a motion honed through years of use. "Yes sir." Call it a form of atonement for the Thanos incident? She remained at attention, waiting to be dismissed, if she was going to be. Work to be done, and all that.