I'm afraid it's not that one, but I know one that was written at the time & begins

Have you heard of a plane called the Lockheed U-2,
Flown o'er flags are all red, and not red, white and blue?
She flew the Stars and Stripes of the Land of the Free,
And gave the other side a propaganda victory.

Oh it just can't be true, no, it just can't be true --
Can we have a spy on that Lockheed U-2?
It just can't be true, no, it just can't be true --
If they do it, we might as well do it too.

To the tune of "Good Reuben James", of course.