Strelok.

[img]http://vignette4.wikia.nocookie.net/stalker/images/f/fc/SHOC_Strelok.png/revision/latest?cb=20090328093531[/img]

And his running mate Major Degtyarov.

[img]http://images3.wikia.nocookie.net/__cb20100122203854/stalker/images/3/37/Degtyarov.png[/img]