In Halo 3 it was the Spiker, but what about Infinite?
The Pulse Carbine is probably reserved for Elites, the Ravager is a semi-power weapon (thus presumably used by higher ranks), the Skewer is a power weapon, the Shock Rifle is surely too unique to be so common (probably at least a semi-power weapon too), the Mangler is just a revolver.
Are they even going to have a primary weapon in the same vein as the Spiker? Or will we simply see them use a variety of the aforementioned weapons as well as the UNSC arsenal?