Transfer here, and take the medicine/pills/green flask (you might need it, but you don’t want to take the flare bombs to your next level if you forget, anyways.) Charge right. You can talk to the infamous, haughty Killt and his assistant for a rather long time. Or, you can shoot the gun so he disappears, but be attacked. (There is a better way… but I won’t tell you here.) You're probably going to shoot down the barrier anyhow, but anyways...
Either way, go into the first door and grab the free man. Get back out and look at the right. A barrier! You gotta shoot it. (You don’t HAVE to; check out all of BCHQ and find out the secret method of getting past the barrier!) Then swing right and go to the second door, where you get the brown/orange communicator, which you don’t really even need. Exit manually or walk to the edge.
NOTE: This barrier is very fickle! Seriously! See this movie for what I mean.