The story is true, the pilot was a little crazy and of course very brave, but I'm not sure this was an acceptable way to use (risk) resources like the pilot himself, the plane, six bazookas, and the precious spotting coordinates for artillery, ( not necessarily in this order) to immobilize a tank or destroy an halftrack.
General Patton gave even him a prize despite a mistaken air attack against US troops (in fact try to find a target, aim and fire, all alone with no help, no orders, no co-pilot, and no radio, easily causes mistakes) so the only certain thing is that Patton and me do not have the same opinion about the best efficient use of a observation plane...
But may be a US General today would see things in another way.