If you don't know where the dome trail is, or don't ride it
because of the military presence thing, here is some Beta:  To
receive a military pass:  1) Go to this link  2) Follow the
directions and quickly register for a pass. I do this on my
phone and take a picture of the pass. That way it's on my phone
to show MP if I need to.  3) Call the number on the pass and
listen to the recording, push the buttons to sign into Area
428-429 which is the tank trail and the dome area  I'm back in
that area nearly everyday, and haven't seen an MP for a few
years. They do make laps on the road though, I just miss them I
guess.  Easiest place to tell you directions. 1) Start at N.
Bivouac TH and ride East toward the mountains. Continue under
the powerline clearing and through the military fence higher up
the trail.  2) The trail turns north and you'll cross a skinny
bridge over North Fork of Campbell Creek. The trail turns into
the tank trail. In a little over 1/4 of a mile the dome trail is
on the right.  3) A no brainer