Back To The Wall
In the military, they are glad to have their back towards the wall, since it means they’re safe. It doesn’t mean they have nowhere else to go, it just means they don’t have to watch out for the threats coming from behind. They only need to be extra careful of what is in front. Even when they are not in the service, soldiers usually go for a seat which has a wall behind.

Back To The Wall
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Hospital Corners
Neatness is a big deal for those serving in the military, so their beds reflect this ideal. “Hospital corners” is a way to make sure every bed is neat and the beds all look the same. They don’t call it a bed uniform for nothing.

Hospital Corners