The surname Langejürgen is not all that common and appears to be from northwestern Germany. The German war graves database has seven people with that name, but none match Heinrich. One option would be to contact the Deutsche Dienstelle and submit a tracing request. Unfortunately, army records were largely destroyed by the end of the war, so they may in the end have little or no information. It also takes about a year for a response.
http://www.dd-wast.de/frame_e.htm