I recognize the symbol on these badges from before Deathwing's attack on the city. It belonged to soldiers in the old barracks, west of town overlooking the harbor.
Your timing couldn't be better. One of my top agents, Jack Bauden, has been trying to infiltrate the Twilight's Hammer cult for me. Last night he went missing. If you and Anduin are right, the cultists are holed up in the old barracks. Time is urgent! Assault the old barracks, take out those cultists, and rescue Jack Bauden.