James P Deadly testimony on the Net:
"In the Spring of 1945 1 was shot down again, this time over American soil by an American captain while I was towing a target from a P51 for aerial gunnery practice. He flew too close and was over eager to try for a good score! But therein lies another tale."
This probably occured over Florida on 20 March 1945, Deadly was flying the P-51K 44-11814 (at least he is recorded to have an "accident" this day with this aircraft).
Source:
http://www.324thfighter.org/ToTellTh.../telltale.html
http://www.aviationarchaeology.com/s...sp?Pilot=Dealy