I was thinking about some of the hassle and confusion that might arise out of the "Comrade" rules in Only War. I think the easiest and quickest way to generate a Comrade for your Only War character (for those classes that get a Comrade) is to simply use the statistics for the generic Imperial Guard Trooper NPC on page 372 of the main rulebook, give him the Aptitudes of a Weapon Specialist (for the pupose of raising stats, talents and skills), and then randomly generate a name and demeanor as per the game rules. That would provide the character with a suitable Comrade without having to go through the hassle of generating a whole other characer after you've already made your main character.
I think I will use this when I run my Only War campaign.