Shamhan grew up in Zargabad under the rule Col. Aziz, and was heavily indoctrinated into the ways of the Revolutionary Army from a very young age aspiring to achieve future leadership positions within the military. However, the US Invasion put those aspirations on hold and as the reovlutionary army quickly crumbled Sahmahn joined the insurgency and proved to be a very lethal "demolition expert". Howevewr as the US military started to increase its pressure on the insurgency, Sha managed to slip away into Chernarus under the veil of refugee status.
After achieving this status he mostly stayed in the western parts of Chernarus, never really traveling to South Zagoria until the outbreak was reported. Interested in the abilities to weaponize the virus against those who opposed him, he set out to investigate the possibilities.