Whilst it's the Gobbos that actually do most of the work on the various war machines, they are often accompanied by Orc Bullies to shout at them.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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An Orc Bully counts as an extra crew member (and an extra wound) for the war machine, and is always the last model to be removed. Orc Bullies have the Choppas special rule. In addition, while the Bully is still alive, their unit gains the Size Matters special rule and is no longer subject to Fear Elves.