You cant but there arent any codes that need lower cased letters.
Go to the black ops website and click theater
Sadly, There is nothing. You can't do that in Black Ops.
You can get it on PC
yes
doa
DOA
Nothing you type in will get you a bot
You can't make one on black ops, you can on your computer, though.
3arc unlock
on the computer
with the computer
3arc unlock