Hello Gary,
Although not related to the Uffz Koch you are looking for, I found this other German pilot named Koch. Maybe you will like and start to find out the many Koch(s) that have flown with LW and USAAF:
20.04.1940LA CHAPELLE SOUS CHAUX (90)BF 109 E-3
Bf 109 E-3 du 2./JG54Victoire confirmée du Sgt Boillot du GC II/7 de Luxeuil, Il tirera 27 obus de 20 mm et 210 balles de 7.5 mmTombe à proximité d'un étang à I km Ouest de La Chapelle sous Chaux Le Lieutenant Helmut Koch sera tué
Yours,
Adriano Baumgartner
the information came from:
www.histavia21.net