"Air Assassinate Chamberlaine" is an optional mission objective in Sequence 7 / Memory 03: Commodore Eighty-Sixed
Walkthrough[edit]
This adds some difficulty to dealing with the Commodore. Only in that you want to get onto the ship without getting noticed. Take to the rigging after that and climb up. There you can easily take out the Gunners in the rigging and start lining up your assassination of the Commodore. Be sure that the Commodore is targeted as he guards stay very close to him.
