Re: War HERO
IMHO a "Military HERO" or "War HERO" genre book is a very cool idea. It should be a generic tome - hopefully followed by several setting books later on. This genre book could examine military life, the rise of armies, technologies used throughout history, expand the FH mass combat system to cover other periods, etc.
Regarding setting books, "WWII HERO" would be an instant success - it would be the surest bet. And judging from other hobbies, a "Modern War HERO" or even a "Roman/Crusader/Napoleonic HERO" would probably be very welcome also.
Also, the mere existance of the genre book would help those who try to set up a military RPG campaign in other alternate periods not so popular amongst roleplayers. So GMs anxious to set up a... let's say "Italian Wars HERO" campaign in the early 16th C would have something where to start from!