Just on the topic of why people sign up: I think many people join because they really think they're doing something good - defending those that need protection or help from the 'real' bad guys. Obviously that's not 100% what's really going on all the time but it has enough truth in it to be attractive. And I think it's true that some real good is done by (most?) military organisations - ie disaster relief, some major engineering projects, policing in areas without effective security, etc, so some people do get to live those ideals out, and pass along that part of the military culture. It's not _entirely_ propaganda, nor it is all shooting guns at people.