Simplify the following text for a Grade 8 native English-speaking person.
Original: For branch-of-service identification , Wehrmacht vehicles bore alpha-numeric identity licence plates : WH for the Heer , WL for the Luftwaffe , WM for the Kriegsmarine .
Simplified: Wehrmacht vehicles used by Heer , Luftwaffe or Kriegsmarine had license plates with WH , WL or WM .