The claim: Home of the German Luftwaffe in Amerika; major UN base. New facility being built on this base, according to recent visitors. Many former USAF buildings have been torn down by the busy and rapidly growing German military force located here.
What it really is: The claim about the German Luftwaffe being there is in fact true, and they do have their own training tactical center (which was established in May 1996) but the Luftwaffe uses the space as a training facility only. This information is publicly known. There are about 600 German personnel there as of 2007, but these numbers can either increase to as much as 900, or decrease, depending on the actual training needs.
While NATO allies have been offered to use the base for training, the UN has not, and there is UN troop presence there at all.
It wouldn't surprise me if many of the buildings have been torn down and replaced, as the base has been around since World War 2, and many old buildings from that era tend to need to be replaced from time to time, plus many of the most modern and high tech air craft of the air force are flown out from there, and thus there is a need for modern and high tech buildings to support these aircraft, and in many cases it is just more cost effective to replace rather then upgrade these building (sometimes it's the only thing that can be done).