Betrayal and losses are what he had to endure during his time as the elite Mexican Armed Forces operator when dealing with the mafia cartel, who seemed to work together with the Chinese's NCS forces during the height of WW3.
But as he found out the truth behind the pile of drugs in the cartel's warehouse, he witnessed something that he shouldn't have seen. That's when the military suddenly stabbed his back and let him rot in the blackened warehouse of drugs.
Henceforth, he's had enough with the bullcraps, approached Tokino Shutoko, and wants to fight for literal justice. Even if it means committing genocide toward innocents in the enemy territories.
PS: I changed his hairstyle & the outfit.