Unknown Engineer

It is not Joe Oleskiewicz or Jake McNiece as it appears in many books or internet pages for these reasons

None of the F13s knew who the engineer was and thought they must have been assigned to Exeter for D-Day.

Joe Oleskiewicz's Mohawk is wider than the engineers 326th

None of the F13s wore rank insignia on D-Day, it was 326th who painted the rank insignia on their uniforms.