I'm sorry. What?

> "In basic training, we had to shout everything and repeat every instruction we were given." ... "So that one day, if we’re getting shot at or shelled, we’d repeat instructions we were given clearly so that the message could be passed down the line without the individuals passing it on having to think about it."

The reason for repeating is maybe someday help a dude pass along a shout ... as opposed to confirming the accurate receipt and understanding of the order? Maybe the shout thing is a nice side benefit, but in no way is it the primary reason