Stelle units in Bulge 44

[Green]

What are these "Stelle" units in the campaign scenario of Bulge '44? At the beginning most of them are one turn only units and I have no idea what to do with them.

They can do the following;

• Be used as spotters for artillery.
  
• Be moved into Obstacle hexes to give them the penetrated status.
  
• Be moved into Minefields to give them the penetrated status (not very useful).
  
• Draw defensive fire.
  
• Reveal a unit by moving adjacent to it (Visibility is only one hex on turn 1).
  
• Use Recon Spotting (probably a waste of time).
  

Plus whatever else I have not thought of...