Under the nets are 155mm self-propelled howitzers taking part in the REturn of FORces to GERmany (hence, REFORGER) exercises that took place by US Army Europe from the 1960s to the end of the 1980s. This is from the 1986 exercise; I do not know which unit.
The one in 1984 took place in the severest winter Germany had experienced since WW2. I froze my kundingi off. I was a battery commander in 2d Battalion, 3d Field Artillery, 3d Armored Division. My battalion was stationed in the town of Butzbach, West Germany, about 55 km north of Frankfurt.
At the time, my wife and I lived in a very nice, govt.-contracted duplex in Dorf-Guell, near Giessen, pinned here in this screen grab from Google Earth:
This was a northern Reforger (they alternated north and south in the country), so the town was in the thick of the action. During the exercise one day I pulled into a phone booth to call Cathy. She told me that an aviation unit had set up field operations in the very large fields behind our house. I already knew that was "enemy" territory.
So, artilleryman that I was, I apologized to her that I was going to have her blown to bits. Then I grabbed the grids off my map sets and sent it with target description to 3AD Division Artillery's operations center. From there it got handed off to V Corps Artillery, which moonscaped the field (in an exercise-y sort of way) with 8-inch artillery. Darn shame about my wife, though.
Later I learned that Divarty had actually credited her by name as the target-intel source, though, so she had that going for her at least.