Rogue Trader : The Barbannos Dynasty
At one point, Andar had attained the rank of Commissar in the Imperial Guard. However, when he found that his views were differing greatly from that of the planetary government, he decided it was time to find a new playing field. He considered organizing a mercenary force, but around that time, Malachi Grael showed up, and Andar signed up without hesitation. He’s been with him ever since, leading the dynasty’s militia.