[@Andreyich] well, by the 51st millenium the Astronomicon's been dead abit, and most SM have become free companies by this point in time in the Imperiums gradual demise. Most Deathwatch actually ended up on Titan with their Inquisitors but it's not impossible, though I'd personally recommend being a part of a free company by this point.

Forgot to mention, if anyone would like explanation without reading the in depth stuff feel free to ask I've read all of it.

TL;DR yes you are allowed to but need good reasons as to why you got seperated from your inquisitor and such