This idea predates Trump by a couple of decades but it's something he's enthusiastically supported. Responsibility for space based military activity in the US is largely split between two groups, the US Air Force and the National Reconnaissance Office (NRO). There are other players but neither they nor the NRO are really a part of the discussion to create a Space Force so I'll leave them out of this discussion. I would like to leave you with one tidbit about the NRO meant to show the overall scale of space projects we're talking about - NASA got exactly one Hubble Space Telescope while the NRO got over 20 (of various models) and get a new one every 3-5 years, give or take. People have called the Keyhole system (the NRO's telescopes) 'Hubble-class telescopes' when in fact Hubble is a Keyhole-class system, right down to the design flaws that it inherited from that platform. Anyways, for the last two decades there has been a bipartisan effort to establish a space force on the grounds that responsibility over space military forces should be removed from the Air Force. There are multiple reasons for it and they tend to echo the fight over the split between the Army and Air Force in the 1940's. These arguments go something like this: The Air Force is primarily built around air power. Space requires different tactics, different technologies, for different purposes. It's a different domain and the Air Force can't be reasonably expected to be in charge of it all. As a consequence of the Air Force being built around air power, all of its marginal dollars tend to get soaked up by overruns in big-ticket development programs like the F-35 and KC-46. This starves the space services within the Air Force of funds for their own R&D/Procurement at a critical time because- The Chinese and Russians (mostly Chinese) are rapidly developing counter-space capabilities and intelligence assets and challenging the US's technological, numerical and logistical advantages. The US has been at war for almost two continuous decades. A direct consequence of this is that promotions to command authority within the various military services is more or less restricted to officers with combat experience. Due to a variety of factors, the military commands that are responsible for space assets are not classified as combat commands. They could be directly supporting soldiers in war zones with intelligence and communications services and actively contributing to battle but they are not classified as combat commands. This means that the kinds of officers that are knowledgeable and committed to space are passed up for commands due to lack of combat experience. The end result is that the upper ranks of space assets are staffed by guys/girls who at best see the assignment as a short stepping stone on their way up the ranks. As such, space suffers. This really is a bipartisan, if not super popular, effort. Adam Schiff is the highest-profile active Democrat that supports this or similar ideas. Prior to that, President Obama proposed a Space Corps (analogous to the Marine Corp) and the idea has even attracted support from famous liberal space intellectuals such as Neil deGrasse Tyson. Way back in 2001,Tyson suggested the creation of a Space Force while he served on a panel put together by President George Bush to report on future of the American aerospace industry. It has never been a particularly popular position but it has a lot of merits. I actually think this is necessary and to a lesser or greater extent accept the major arguments in favor of such a proposition. My major concerns with this is that it will in effect become a massive giveaway to the military industrial complex. Indeed, the major criticisms against the Space Force are about cost and duplicated effort. The current secretary of the Air Force released a report she was ordered to make estimating the cost of creating the Space Force. When the price tag she reported was embarrassingly high ($13 billion over 5 years), Trump's lackey's began spreading rumors that he was threatening to fire her. The bullying worked and she's since publicly come around in full-throated support of the effort but the way the Trump administration handled this highlighted my other huge problem with this proposal: Trump can't be trusted not to screw this up. Also, $13 billion will be a drop in the bucket if this thing happens as the new branch will likely be given a wide berth to spend as it pleases in the name of catching up to the Chinese regardless of how wasteful the spending is. What all do you think about the proposal for a Space Force?