Standing At Ease
You may think that when soldiers are “at ease”, it doesn’t seem like they feel very comfortable. However, standing in a specific way for several years makes a stance feel comfortable, even back in civilian life.
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Sir And Ma’am
In the military, they teach soldiers to be respectful. Regardless of the person they are talking to, like the mailman, the servers at a restaurant, or their parents, soldiers address a man as ‘sir’ and a woman as ‘ma’am’.