I'm currently designing an investigation-based adventure for my group, and I encountered a lore question. I designed a series of clues pertaining to bio experiments in the underhive/lower middlehive of Hive Sibellus. One of the players in my group knows a fair amount of lore, and so would probably guess that bio-experiments and such tech heresy might suggest at the Logicians, and so I decided to purposefully make the Logicians into a red herring.
To do so, I came up with the idea of an ex-military psycho who wants to create the perfect super-soldier, and then mass produce them (think Cosco Space Marines, to a certain degree). He has managed to collect enough material to start performing his experiments (I have yet to decide how he might had done that, whether abducting scientists, buying them out with money from somewhere, or corrupting them slowly). The major problem I have currently, and the lore question, is how would someone actually leave the Imperial Guard? It seems that, according to the MO of the 40k universe, if you get drafted, you're in for life (however short that may be). What kind of position could he have obtained so that he was able to leave?
That aside, a brief bit of information on why I chose the Imp Guard as his career is pertinent. In the various campaigns he participated in, he witnessed thousands upon thousands of lives spent against the horrors of the universe to gain fairly useless goals (such as in the Margin Crusade). He also, of course, heard of the Space Marines and their legendary conquests and victories and such, and maybe even saw one once (a "bright star in the firmaments of battle" and all that jazz). He then grew to hate the Imperium, because it was wasting mens' lives for useless tasks when it had the technology to create super-soldiers and the like, and so he decided to attempt to create his own version (which is, unquestionably, tech-heresy). The twisted nature of his mind has justified the many lives he has wasted in his experiments (all underhivers, so they don't matter, of course) by the idea that it will eventually save thousands, if not millions, more were it to be successful.
In addition to the lore question, feedback on the story idea would be great. Thanks.