Aleksi was a squad designated marksman in one of the two Jaeger companies from Finland doing a joint exercise with the CDF in Chernarus when the infection hit. The two companies got stuck when they closed the borders and as the shit hit the fan and Russia started bombarding they retreated in to the woods close to Myshkino.
With no intel coming from anywhere most of the finnish troops decided to head for the border to go across. Some of the soldiers did not wan to leave and decided to stay fearing that they would all be shot and killed by the russians or the CDF without even having the premission to shoot back. After living in the woods for a while with maybe a platoon worth of soldiers left the infected found the camp and Aleksi fought his way out of the camp with a friend of his but later he found out his friend had been bit and after he started to get a fever they both came to the conclusion that he was infected with the same virus that made people into these things so Aleksi was forced to kill him. After that Aleksi wondered into the chaos that is the populated areas of south Zagoria not knowing what he should do next... Later he joined the NATO forces working in the area to help them bring stability to the country...and himself. After a long and painful journey of death backstabs and hate the NATO command has let the soldiers down and Hauki has completely lost his faith in NATO higher ups (not including Yuri) and he now just wants to protect the original brothers he has shed blood sweat and tears with.
Sgt.Hauki executing a Russian "civilian" after reliable intel proved that he was a spy