Major Variants:

M808C: Still in service with armored units throughout the UNSC Army and Marine Corps, the previous "mainline" iteration of the M808 features a M512 90mm smoothbore cannon for anti-tank and anti-fortification use, and a pintle-mounted M247T 7.62mm medium machine gun. It is substantially heavier than the M820, massing 66 tons (59.9 tonnes) when fully loaded.

M808B: This older variant does not have the M247 pintle mount, but adds a coaxial M231 medium machine gun to the main turret, controlled by the operator. This versatle chassis saw a law number of locally-produced variants and field upgrades over its nearly two centuries of use. The UNSC Army made periodic attempts to codify these modifications, with little success. Recorded examples include the UE8-14 and 12-9FS, both of which had thinner armor augmented by ceramic appliqué plates to make the tank easier to air transport.

M808B2: The “Sun Devil” variant replaces the 90mm cannon with two twin-linked 40mm autocannons. Ostensibly an anti-aircraft vehicle, the Sun Devil was used in an anti-personnel role throughout the insurrection years.

M808B3: Used for heavy fire support roles, the “Tarantula” variant with its two mounted pods on either side of the turret can fire clusters of hypervelocity Scimitar rockets. Its ineffectiveness against Covenant forces meant that most B3s were converted back to standard B models.

M808: The first M808 model entered service in 2218.