The neverending story

You sneak up close behind in the shadow as you approach the gunman. He is unawar you exist behind him. As you creep up behind him you wrap your arm around his neck and cut off his breathing, taking him out.

You creep up to the northeast corner and see a lady dressed all in black. You walk up next to her and she sees you."Listen we can't talk here, take this key and head over to the airport in the locker you will find what you need. Now go."

She hands you a key with the number 5 engraved into the key which must be the locker.