There's a field at Vogelweg (part of that community)
Kaiserslautern Rod & Gun Club - Located at Building 2960 Vogelweg
Field: Vogelweg (Rheinland-Pfalz)
Comments: Paintball - Sat & Sun 1000-1600 (lots of wooded fields; some wooden bunker "hyperball")
You can find more fields on the ~Official European Field Thread~
There's usually a number of players there; mostly military and a few Germans from time to time. I'm from Heidelberg so I don't go down that way very often now that we've got our own field.