You get an achievement/trophy, and the feeling you have accomplished something.
if you get all intel, you get an achievement.
no
Got to the computer and type 3arc intel.
you get a trophy
3arc unlock-for zombie maps 3arc intel-all intel and all mission completed
Nothing
EVERYWHERE
Intel is 3arc Intel
one is 3ark intel= all weapons
To get all hidden intel on the terminal you have to type 3arc intel and it will say this cheat will disable the "Find all intel" achievement do you want to continue? Click yes and there you go.
By finding it tthroughout the campaign like in all other cod games
You get an achievement called NO-LIFE worth 9999999 gamerscore