Kalco is a major character in the Reiko-10 story. He is a famed soldier who is assigned to the Reiko-10 base for a short stint under Zaier. He is confident and a bit of a braggart but has a endless well of combat stories he has lived through. He does not play the fool exactly, but is much smarter than he lets on, and uses this act as a way to see through the deception of others.
Soon in the story of Reiko-10 he realizes the reason he is here is due to the similarity to a mission in the past where he was the only survivor out of two elite groups of soldiers.