On level 10 Fallen Angel to easily kill Bulion stand behind the wall, arm the grenade launcher press either R2 or R1 and shoot. Hopefully you will not loose any health after collect the heavy armour after you have killed him.
Hint: when your in the first level (courier)go up to the guard that is next to the metal detector and punch him in the face.
(You will get 6 or 7 pk2) rounds as soon as you punch him press start,go to invetory,get out your pk2 kill him then go through the metal detector there will be 4 more men, next go through the elevator and when you get to the top don't move you will hear someone say "don't shoot" 3 men will come after you.
First 1 person will come then the other 2 come together(watch out, the one man has another behind him) then find a room where there is a sideways picture press o the wall makes an entrance stop at the doorway and go in sniper mode and shoot him in the head.
When he dies go over where he was there is armor, and a shotgun go to invitory and get out the fingerprint scanner scan his coffe cup then go over to the door that has a lock on (it is right next to you on your left).
Go up to it and press the o button you will be out of that room now go straight towards the steps with a door on top of it use the finger print scanner and open that door.
This girl will kill this man when she runs away take the briefcase and go over to the window and smash it.
On level Masqerade, when you are trying to get pass those two soldiers.
Most people punch them out but I went to Inventory and selcted Night Vision Glasses, put them on, and turned the lights off with the switch on the right wall.
Go forward and hide behind a barrel and crouch (L1) and wait till a soldier walks next to you. then walk fast past the soldier guarding the wall lol he was walking on the wall.
Hide where there is a door in some kind of hallway wait till there are the two soldiers are guarding where they were before and sneak (crouch and directional keys) take out your Security Keycard and and press X to slide it on the slot.
Don't get 2 close to the guards cause if u do the guard will say something and the other will shoot you. sneak (if your game-paranoid)
to the door and open it. This works I swear it. GL Later Days, Spikee