Understanding the language
That reminds me of this joke:
The reason the Air Force, Army, Navy and Marines bicker amongst themselves is that they don’t speak the same language. For instance, take the simple phrase “secure the building”.
The Army will post guards around the place.
The Navy will turn out the lights and lock the doors.
The Marines will kill everybody inside and set up a headquarters
The Air Force will take out a 5 year lease with an option to buy.