Well, this route - From "Short Bike Rides in and Around Washington, D.C. (3rd ed.). Michael Leccese. The Globe Pequot Press. 1996" - mimics some of Janice's route. It shows the Pentagon, but doesn't have any routes that go specifically by it.
The book has has another route that goes around Arlington that is on the Mt. Vernon trail. Anyone know if that trail goes by the Air Force Memorial?
Here's a link to the ride....Sorry about the crummy quality - the scan looks fine. PM me if you want a higher quality file. (ed. Actually, it's not too bad)

http://i193.photobucket.com/albums/z...numentride.jpg