Stelle units in Bulge 44

[Simulacra53]

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.

https://en.m.wikipedia.org/wiki/Operation_Greif


The Einheit Stielau commando unit had been assembled from the brigade's best English speakers, but few of them had much if any experience of undercover operations or sabotage. There was little time to train them properly, but they were given short courses in demolition and radio skills, studied the organization of the U.S. Army and its badges of rank and drill, and some were even sent to POW camps at Küstrin and Limburg to refresh their language skills through contact with U.S. POWs.
Dressed in U.S. Army uniforms (the highest U.S. Army rank used was that of colonel), armed with U.S. Army weapons, and using U.S. Army jeeps, the commandos were given three missions:

1. Demolition squads of five or six men were to destroy bridges, ammunition dumps, and fuel stores.
   
   
2. Reconnaissance patrols of three or four men were to reconnoiter on both sides of the Meuse river and also pass on bogus orders to any U.S. units they met, reverse road signs, remove minefield warnings, and cordon off roads with warnings of nonexistent mines.
   
   
3. "Lead" commando units would work closely with the attacking units to disrupt the U.S. chain of command by destroying field telephone wires and radio stations, and issuing false orders.