Other than guns, weapons, judo, tanks, jets, subs, gadget, gear, armor, engineering, they have to put in a lot of time as computer programmers, on high level languages, using internet technologies. Those are the ingredients of an orthogonal war. The sizes of the monsters in space is huge, imagine a beta monster having stars as snacks the size of the sun. So war engagement requires lot of internet abstraction then wiring it all up with the earth news channels, while staying aloof of loge cities on earth. All this is just visualization, abstractions, internet, creation of apps where you could strategise all of this and be able to introduce your stake into their world, like हैकिंग. Each marine has its own self sufficient warrior soul protecting it. So he or she needs to be a computer programmer हाफ his life, even building virtual realities like the Xatrix.