Final answer:
Subordinate commanders relay commands traditionally over the left or right shoulder, but the question omits the specific position. This topic relates to military tactics and command organization, which are typically studied within social studies and history courses.
Step-by-step explanation:
The student's question pertains to military command structure and drill procedures, specifically regarding where a subordinate commander gives a supplementary command. While the question itself omits the specific position, traditionally, commands can be given over the left or right shoulder. This concept relates to the organization and maneuvers of military units, which is a common subject within social studies courses that cover topics like military tactics and history.
Subordinate commanders are officers who act under the direction of a commanding officer. They must be able to effectively relay commands and organize their troops to maintain the proper execution of strategies, often derived from classic principles, like those discussed by Sun Tzu in 'The Art of War.' In his work, various tactics are described that emphasize the importance of command and control, such as conducting a flanking maneuver, which involves moving around the side of an opposing army instead of attacking head-on.