Invisibility:
     When  Playing press Back, Back, Start, Start A, A, B, B, X and Y.
This will make so that you will not be seen while playing.

Boot Camp:
     After  you complete the task of looking at the lights, walk right
and  go  through the door. On the shelf you will find a lock pick. You
can  use  this to pick the lock for the door just next to the entrance
for covert ops. You will find a keypad code, which can be used for the
left hand door at the start of the level.

     If you're lazy, the keypad code is 5656. Use the code on the left
door.  Through  this  door are two rooms, Grimsdottir is in the second
room.  You  can  talk  to her, but of course, hitting her will get you
fired.