One of the primary M1A1 variants used by the USMC (US Marine Corps) was the HC, or Heavy Common variant. The biggest upgrade this variant has is the AN/VLQ-8A Softkill APS system mounted on the roof, which no other mainline Abrams variants get. One such example of the M1A1HC is the real tank named "Click-Bait". The tank was made somewhat notorious in online circles after an image of the tank with a plastic lawn chair surfaced on the internet during one of its combat deployments.
The M1A1 Click-Bait was introduced in Update "Air Superiority". Besides the chair on the roof, the Click-Bait is differentiated from the normal tech tree M1A1HC with the kill marks on its gun, which accurately title some of the vehicles it has destroyed in combat. The M1A1HC seats itself as the chairman of the top tier premium tank selection for the US tree. Players playing the Click-Bait should take a seat (preferably not in the chair on top of the tank) as they use their mobility to move to advantageous spots in combat and their great reload rate to quickly finish off opponents who did not succumb to the first shot.