Interesting! Never heard of that before. My P51 has come in handy many times as other than a can opener. Poke a hole in something, clean out under a fingernail, even as a screw driver.
After 9/11, the airport security was confiscating the P-38s and P-51s.
I remember the stories of the guys who had them from Vietnam, usually on a key ring, having them taken.
last I heard they are both still subject to confiscation.
as a side-bar, what they did to Joe Foss shortly after 9/11 was unforgivable.
He was carrying his His Medal of Honor and they thought it could be a weapon.
They made him remove clothes multiple times.
They confiscated other stuff but let him send it home.