Palemon is one of two Tactical Marines to survive the Battle of Sekundar. He followed Leonatos into exile, and provides accurate Bolter fire to cover his brother's assault in close combat. In battle he's been know to keep a healthy distance from the blood-crazed Cloten.
A close up photo of Brother Palemon's head. Ironically the head is from the plasctic WHFB Chaos Warriors acessory sprue. I personally love the monk-like haircut Palemon sports, and it gives him a severe look.