Hello every one, I am playing call of duty Modern Warfare reflex. Now I have problem. The problem is: when I in the misson and I picked up a weapon call: FGM-148 JAVELIN. they want me to destory the bridge. so I press B to fire. but it ask me to (lock on requested). can some one tell me that how to lock on. thank you very much, please email me with ( linsumin2@gmail.com ) Thank you again.