It was the old UT mod Infiltration.
Its now called Ground Branch and is being built on the Unreal Engine 4.
TC is DEAD. I loved it, but its DEAD.
Ground Branch is almost EXACTLY like TC.
I hope you guys will come over to it. And bring your maps and skills too!
You can get a demo of it off the web site. I see on the site, one of the old ( and one of the best ) mappers has also come back and is rebuilding one of my favorite inf maps for the game.
Hope to see you guys on the forums!
http://www.groundbranch.com/