There is a discussion of the loss of a Lt Olger Aal at Helen-Bos on 29 Aug 44 on the link below. The final comment #6, seems to be talking about the "Orsmaal" field which was apparently attacked the same day. Supposedly Aal in a group of 5 planes was last seen attacking a satellite field at Diest/ Schaffen, yet no-one saw him go missing at that field. When the planes formed up after the attack Aal was missing yet no one saw him go down or heard anything on the radio. I wonder if he somehow flew south from Diest/Schaffen and possibly attacked Orsmaal and ended up crashing at Helen-Bos?
http://forum.armyairforces.com/P47-4...4-m129170.aspx