UNSC ships in Halo must keep their fixed MAC guns pointed within a useful firing envelope. Corkscrewing around a central point lets them alter their position while preserving an opportunity to shoot. This combines three-dimensional movement with the constraints of a weapon tied to the ship's axis. Ships that abandon the manoeuvre are described as vulnerable to an energy-projector strike down their centreline.
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How Halo warships manoeuvre around fixed MAC guns
Halo's UNSC ships use corkscrew manoeuvres to complicate enemy targeting while keeping their fixed MAC guns able to fire.