Robert M. Gary wrote:
The Navy has shot down at least one airliner who got too close
to a task group in the middle east. It was the subject of an
investigation, not sure what happened with that though.

http://en.wikipedia.org/wiki/USS_Vincennes_%28CG-49%29

http://en.wikipedia.org/wiki/Iran_Air_Flight_655

The plane was
also on the wrong transponder code.

But not this. The aircraft was using the right code. The sailors aboard
the Vincennes just didn't bother to check the civilian flight schedules.

TheSmokingGnu