Final answer:
The general order for sentries that states not to salute an officer if it interferes with duties is meant to prioritize security and vigilance over saluting, which is a form of military courtesy.
Step-by-step explanation:
The question "What general order of a sentry states 'do not salute an officer, if doing so will interfere with proper execution of duties'?" pertains to one of the general orders or rules governing the duties of a sentry or guard in military service. While the exact phrasing can vary slightly by the country and branch of service, the U.S. Navy's 11th general order gives a sentry the instruction to salute only when it does not interfere with their duties. Specifically, this order states that a sentry should 'be especially watchful at night, and during the time for challenging, to challenge all persons on or near my post, and to allow no one to pass without proper authority.'
In practice, this means that the primary responsibility of a sentry is to maintain security and be vigilant. Salutes are a form of military courtesy, but not at the expense of compromising security or the proper execution of duties. This general order ensures that a sentry's attention remains focused on their essential responsibilities.