Iron Horde Naval Manifest

Iron Horde Naval Manifest drops from the following orcs in Tanaan Jungle:
 * Grom'kar Sentry
 * Grom'kar Leadslinger
 * Grom'kar Reinforcement
 * Grom'kar Warsmith
 * Grom'kar Cauterizer
 * Grom'kar Dockhand
 * Sergeant Mor'grak
 * Grom'kar Warrior
 * Harbormaster Korak

It can also be looted from the following objects:
 * Bottle of Machinery Grease
 * Inferno Shot
 * Box of Iron Horde Equipment

As a quest objective

 * A Little Wetwork