You are walking with a Lieutenant as a commander approaches. You should take which of the following actions?

When in the presence of a higher-ranking officer such as a commander, it is crucial to adhere to the established military customs and courtesies, particularly regarding saluting. The correct action involves rendering a hand salute after the lieutenant begins his salute.

This approach reflects the proper protocol in a situation where you are accompanying an officer of higher rank. It acknowledges the hierarchy within the military structure while maintaining the importance of saluting as a sign of respect. By waiting for the lieutenant to initiate the salute, you are demonstrating proper military bearing and respect for rank, while still being part of the accompanying formation. This practice underscores the discipline and order expected in military interactions.

The other options do not appropriately reflect the customs of military courtesy. For instance, beginning your salute first could potentially confuse the established protocol, as the lieutenant should be recognized first in this context. Remaining at attention until the commander passes could be seen as neglecting to acknowledge the formation's officer. Ignoring the approaching commander entirely is not acceptable behavior and would be a breach of military etiquette.