This exercise prepares them for the shipboard ceremony of lining up at the ship's sides when it enters or leaves a port. If getting into the academy is difficult, making it to graduation is even harder.
進去難，出去也難既入軍校，軍事訓練的嚴格自是不在話下，但海官新生最常聽到的勸告卻是：「本校在學科方面要求很嚴格，進來固然不簡單，出去也未必比進來容易。」