See through door glitch its good you will need 2 people to do this though.

Go across the left bridge on lvu campus and breach the door with a breaching charge keep open and closing the door to attract the enemies go down the stairs while the other one is keeps open and closing the door your see a board get on to it 5 times pressing L then go back up and the door should be open count the enemies and blow them up.

Note: The host cant do the glich.