[odybvig]

The contact between aircraft and ground army units was regulated by: Merkblatt OKL Lw. Führungsstab,Ausb.Abt. Nr 2880/44 geh.v. 2611.44 "Der Fliegerleitoffisier (Schlacht).
I am not sure if this was a Lw Officer or a Army officer, but it was stressed that the army unit should educate their own if the "Flugleitoffizier" was out of area or lost. And this was regulated by: Merkblatt OKL Lw. Führungsstab, Ausb.Abt. Nr 2600/44 geh.v. Ia/Ausb. 24.9.44 "über Einsatz und ausbildung der Fliegerleitoffisier (Heer)

The Fliegerleitoffizier unit was:
Himself
one NCO (radiooperator)
two privates (radiooperator)
one Driver

Aircraft that could use this comunication was
Jagdverbände with Fug 16z
Schlachtfliegerverbände with Fug 16z
Zerstörerverbande with Fug 10
Nahaufklärer with Fug 16z and Fug 17

That means that at least from 1944 the German army had a Forward Air Controllers in their organisation

Best from Norway
Olve Dybvig