On
some air bases the Air Force is on one side of the field
and civilian aircraft use the other side of the field,
with the control tower in the middle. One day 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 it is an American
Airlines Flight, it is 3 o'clock. If it is an Air Force,
it is 1500 hours. If it is a Navy aircraft, it is 6
bells. If it is an Army aircraft, the big hand is on the
12 and the little hand is on the 3."

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