Knight The Knight, equivalent in the Marine Corp to a Captain, is the highest ranking Junior Officer (Warrior Knight). The Knight is often a staff officer at the Battalion and Regimental levels. The Knight may command a Company, command Apostolates or operational units on the Battalion level, be an instructor in Knight Banneret Candidate School or the St. Michael Academy, or be assigned to other operational tasks. The Knight is the entry-level rank after graduation from Knight Banneret Candidate School or the St. Michael Academy for those who have received Holy Orders or who possess pertinent advanced degrees and experience in theology, medicine, nursing, law, or other professions that are significant assets to the work of the LSM.