What do you guys think "near" future warfare will be like in space? (i.e. next 100-400 years) assuming we colonize a few star systems.
Specifically:
Will there be infantry?
Will we use bullets or lasers?
What would a planetary invasion be like?
Will we have "Shields"? If so could they be penetrated by anything? Would they lose energy as they are hit, as in star trek?
Infantry? Yes. Take away all the bells and whistles of war, and it's essentially a game of take and hold ground, and deny the enemy. You will always need boots on the ground to do the job.
Bullets or Lasers? In my opinion, bullets. Good SciFi not withstanding, lasers are useless as individual weaponry. Bullets are simply the best projectile around. I can give you a better explanation if you want, but bullets do the job. In the future you're likely to see a lean towards caseless, lightweight, smart bullets, with a lot of circuitry packed into the rifle.
Planetary invasion? You could argue that the Romans took over the world, so did the British Empire, and so did the Nazi Party, sort of.
In my mind you don't need to "take over ze world!", you do what the Romans and any empire building nation does: You take over the capital cities and industrial towns, install your own administration in town halls and parliament, etc. and run the place. You don't need to take over the whole country, you don't have the men or the logistical resources to do that. There will always be resistance, but once you're in power, that's game over, really.
Shields? Tough one. I don't reckon there will be, no. You will need a lot, a lot, of power to project a coherent shield made of energy like in Star Trek. Makes more sense to be to simply armour-up.