What Time Is It?

One day, on just such a field, the tower received a call from an aircraft asking, "What time is it?"
The tower responded, "Who is calling?"
The aircraft replied, "What difference does it make?"
The tower replied, "It makes a lot of difference. If you are a commercial airlines flight, it is 3 o'clock. If you are an Air Force aircraft, it is 1500 hours. If you are a Navy aircraft, it is 6 bells. If you are an Army aircraft, the big hand is on the 12 and the little hand is on the 3. If you are a Marine Corps aircraft, it's Thursday afternoon. If you are in the National Guard, it's still a couple of hours until quitting time."
Originally published July 06, 2009.