From Halopedia, the Halo wiki
Type:
Heavy machnine gun
The M43 heavy machine gun is a vehicle-mounted machine gun used by the United Nations Space Command. The weapon is employed on the UNSC's M35 Cougar, mounted atop the vehicle's dual M68 Gauss cannons.[1]
Finalised concept art of the Cougar.
The final Cougar model.
What the Cougar would have looked like in-game.
AIE-486H • HMG-38 HMG • M199 HMG • M231 MMG • M247 GPMG series (M247H (Etilka) • M247T • M247 GPMGT) • M328 LMG • M413 HMG • M43 HMG • M67 LAW • M739 SAW (Appetite for Destruction • The Answer) • Sawtooth chaingun