If the difference between all the military branches is still confusing to you, well, this old meme is an example of Marine humor about airmenpic.twitter.com/fxSMzLOIE9
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"Permission to correct your statement about the location of Napoleon's first exile, sir?"
This kind of thing is just grandstanding and the "permission to speak freely" thing isn't actually some kind of binding agreement to protect you from consequences for trying to call out your boss in a public meeting any more than it would be in a civilian job
Turning it into a code phrase is writers wanting to make the military simultaneously appear more and less regimented than it really is (subordinates are never allowed to give their opinion AT ALL unless they say the magic words, in which case they are protected from all harm)
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