This building within the Oka Ben Nafi Air Base has been painted to match the surrounding lot, including a shrub or rock with traffic patterns around it, and it also appears the lot has been doctored to better hide the building as well, with little whiteish mounds matching those of the building's roof.
Granted, it's been over 40 years now, but that's what I remember from just looking at the photo. I think I could identify my old baracks and possibly the bowling alley.
My home base was the 50th TFW USAF Hahn AFB Germany. Many USAF bases in Europe used Wheelus during the winter months.