I'm a ME, not a programmer. But I'm going to guess that an aerospace company might be a little better at blocking than normal. We are not even allowed to have USB drives unless they are encrypted company ones, I don't mean a password locked either.
That is pretty interesting though, I didn't know running it off a USB would make it anonymous and run through an unblockable port. I thought the ports were through the network card though.
Its only unblockable if they allow standard filtered Internet access. WWW traffic goes over port 80 and web filters are unlikely to work against a Tor setup. There are some other routing tricks or you could setup a SSH tunnel/VPN to home and use remote desktop/VNC/or a paid service like cisco's go to my pc.