Space has all sorts of interesting military applications. You can spy on people from orbit with spy satellites, use satellites to communicate, or built space vehicles to take out the former two. However, what I'm after is some real 'weaponising' of LEO and beyond: nukes in orbit, space lasers, orbital troop transport, et cetera. Now, my question is if these kinds of applications were economically and/or physically feasible in the twentieth century. Could the Space Race have been an arms race? If not, why not? I'm afraid this matter will have no greater purpose than sating my own curiosity, but hey, a fun space thread is fun (by definition)!