Major Abercrombie possibly US pilot of B-29?

[cz_raf]

Hi all,

I am sorry for mess posting my question in wrong folder for the first time, now it should be OK

I am looking for information about man, who should be pissibly pilot of B-29.
I found him in the ORB of No. 149 Squadron RAF equipped by Washingtons (B-29) when he made one training flight as Co-pilot in April 1951.
As there is always mentioned only Captain + Co-pilot I suppose he was a pilot.
He may be member of American staff with the Washington Conversion Unit based at Marham or possibly was getting some practice before going to Korean war?

Any ideas much appreciated.

Pavel