The whole conceit that officers in the military only interact in strict and rigid formality and decorum doesn't even reflect the reality. That's more of a byproduct of mid-20th century propaganda that tried to depict all officers as being robot toy soldiers that fell in line. That kind of depiction of the military pretty much got dropped post-Vietnam.
As someone who served post vietnam , I can say first hand that formalities and decorum did not get dropped in any way shape or form. Im not sure where you got that malarky from.