SPECTRE Regardless those ships will soon be out of service. Now the Autumn is the mainline heavy warship of the UNSC the marathon was not continued because it faired terribly against the covenant. The Autumn class looks similar to the Halcyon because the halcyon's design was highly resilient. Now that the UNSC has the time to produce designs of warships that will not die from one or two plasma torp impacts they will make them. The autumn class heavy cruiser is the result of everything that the UNSC has learned from combat with the covenant. It takes the lessons that were so hard fought during the war and places them at the for front of the fleet. The UNSC is no longer fighting for its survival but it is fighting to gain more than just a foot hold in the Orion Arm of the Galaxy.
Halo 4 the Essential Visual Guide-
AUTUMN CLASS HEAVY CRUISER
LENGTH 1,425M.
BEAM 383M.
HEIGHT 431M.
PRIMARY ARMAMENT MARK IX HEAVY COIL 45J3D3/MAC.
SECONDARY ARMAMENT M58 ARCHER MISSILE DELIVERY SYSTEM.
TERTIARY ARMAMENT M910 RAMPART 50MM POINT DEFENSE NETWORK.
At the start of the war, the UNSC’s two most prolific cruiser classes were Halcyon and Marathon. Interestingly, neither of these classes survived the war unscathed- most Halcyon-class cruisers were decommissioned during the final years of the war with the Marathon-class following shortly behind with only a handful remaining in service. A last ditch effort to rend the Covenant’s control of Reach, however, created the legendary Pillar of Autumn, a heavily modified Halcyon-class cruiser refit specifically for Operation: RED FLAG in 2552. While the Autumn would be destroyed on Halo later, its numerous upgrades were highly regaled and inspired the Autumn-class cruiser, helping to further augment the UNSC’s post-war Navy.