Thanks everyone for the maps and suggestions.
I'm planning on going in on Bombing Range Road and parking in that paved parking area near the end of that road -- before the military checkpoint. Then I thought I would start the hike by the pond that Teegate mentioned, heading north on Log Ln. Then east on Sims Place. The I'm hoping to go south on one of the winding dirt trails that run parallel to Route 539. Then west on Log Ln again to get back to where the cars will be parked. If my hikers still want more, I'm hoping to go south on one of those dirt trails near the parking area and then head west and then back north on the other dirt trail to get back to the cars again. I realize I have to be careful not to get to close to the Defense Department Road -- but I'm assuming there is a fence or at least some obvious signs so we don't trespass.
Hopefully that will be about 5 miles of hiking -- which is my goal.
I'm not doing this hike for a couple of weeks yet -- but once we do the hike, I'll post how it went. Thanks again for your help!