We were in this area about 25 years ago, and it was at the time of the annual motorcycle rally in Sturgis. Literally the roads were dotted with black bikes. My memory of this area this time will be of hundreds of green and yellow army trucks. Apparently at present troops are in the area (not only from all our states but from around the world) for combat training sessions. While in Custer State Park we saw their tent sites. From Custer and Wind Cave Parks we drove to Hot Springs and the Mammoth Site.