Foxstone Park Signal Site

Robert Hanssen, former FBI agent and convicted Russian spy, marked the "Foxstone Park" sign with a vertical strip of white adhesive tape of 6-8 cm length on the post closest to Wolftrap Creek. This was related to Dead Drop ELLIS, under a footbridge over Wolftrap Creek near Creek Crossing Road at Foxstone Park.

http://en.wikipedia.org/wiki/Foxstone_Park
http://restonpaths.com/FoxstonePark/