Leading American historian Alfred McCoy imagines it (via TomDispatch):
It’s 2025 and an American “triple canopy” of advanced surveillance and armed drones fills the heavens from the lower- to the exo-atmosphere. A wonder of the modern age, it can deliver its weaponry anywhere on the planet with staggering speed, knock out an enemy’s satellite communications system, or follow individuals biometrically for great distances. Along with the country’s advanced cyberwar capacity, it’s also the most sophisticated militarized information system ever created and an insurance policy for U.S. global dominion deep into the twenty-first century. It’s the future as the Pentagon imagines it; it’s under development; and Americans know nothing about it.
Although U.S. plans for space warfare remain highly classified, it is possible to assemble the pieces of this aerospace puzzle by trolling the Pentagon’s websites, and finding many of the key components in technical descriptions at the Defense Advanced Research Projects Agency (DARPA). As early as 2020, the Pentagon hopes to patrol the entire globe ceaselessly, relentlessly via a triple canopy space shield reaching from stratosphere to exosphere, driven by drones armed with agile missiles, linked by a resilient modular satellite system, monitored through a telescopic panopticon, and operated by robotic controls.