User blog comment:Tardir/I am leaving/@comment-25033299-20110422215658/@comment-9734625-20110424225524

Simple: They gather the other Chapter Leaders(Captains, Chaplains, etc.) and have a vote. The RC believe in Democracy(That is why, for instance, all the Sergeants of a Company is gathered and being candidates to become Captains if the "current" Captain was killed, and then the others of the company vote for who that will become Captain(But not all decisions in the RC are Democratical, either))