It’s mostly a PR / recruiting / traditions function. Ceremonial guards rarely carry loaded weapons and standing perfectly still makes you useless for force protection. Some units will rotate staff around between ceremonial and actual guarding but when they are in their parade dress standing still that’s 99% pr.
Furthermore, military are not police. They generally have no interest in using force against their own population.
A Canadian sentry at the Tomb of the Unknown Soldier was shot and killed a few years ago. Now *they* are protected by an armed and uniformed police officer.
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