You can change it if you want, I think it's great. 

I will be addressing many Battle-Brothers about their combat doctrines and previous prejudices in my next IC post. As well as giving you all some IC meta game info on why things are the way they and how it all works. 
You will have an opportunity for RP reactions to this, and maybe some skill checks as well. We'll cross that bridge when we come to it.

Also remember, despite what you may think/feel, once you leave your Chapter for Deathwatch you have accepted the leadership of the Deathwatch Command. You know that it's not just your honor at stake, but the reputation of the entire Chapter.
That doesn't mean you have to like it, though you are aware things are going to be different from now on.

And I was wrong, Omega, finish your Character Sheet and move your IC, then you are First to Fight! Someone could still snake it from ya at this point...