Buster Call

Buster Call is an emergency order which calls 5 vice admirals and 10 battleships from the marine headquarters to one spot. When you get targeted by a power of national war class, there'll be nothing left. Originally, it can only be used by the marine's three admirals and the Gensui (chief admiral)

CP9 was granted one opportunity to use Buster Call against the Straw Hats, under the name of admiral Ao Kiji.

Buster call is first mentioned in episode 251, as Nico Robin explains why she left the Straw Hats.