The United States has for the first time acknowledged deploying weapons in Earth’s orbit, marking a significant escalation in the militarization of space. U.S. military leaders now say troops must prepare to fight not only in Earth’s orbit but also around the moon, a region known as cislunar space, as part of a broader push to expand the Space Force to 25,000 personnel over the next five years—double its current size.
Key Developments:
Deployment of Orbital Weapons: On Monday, U.S. Air Force Secretary Troy Meink revealed at the Air & Space Forces Association’s annual conference that the Pentagon has fielded “on-orbit space control weapons” for the first time. These weapons are designed to defend against space-enabled attacks, according to U.S. Space Force chief Douglas Schiess.
Military Expansion and Strategic Shift: On Wednesday, Gen. Dan Caine, chairman of the Joint Chiefs of Staff, stated that the U.S. military must adapt to fight “from the seabed to cislunar space.” Lt. Gen. Gregory Gagnon, head of the Space Force’s Combat Forces Command, emphasized that humanity’s expansion into space necessitates military readiness in this new domain. The Pentagon plans to double the Space Force’s personnel to 25,000 by 2029, up from its current size.
Military Preparations and Allied Responses
The U.S. is not acting alone in this domain. The United Kingdom’s Royal Air Force (RAF) has announced plans to deploy weapons into space by 2035, with a budget of £7.8 billion allocated for space defense technologies, including jamming devices and lasers designed for the gravity-free environment. The UK’s Ministry of Defence described space as a “domain of competition” where adversaries seek to “disrupt, degrade, and deny” satellite services critical to global infrastructure, including finance, communications, and retail.
The U.S. Space Force, established in 2019 under the Trump administration, has framed its mission as defending national interests as human activity extends deeper into space. Lt. Gen. Gagnon noted that potential adversaries, including the People’s Republic of China (PRC), are actively developing space capabilities at a rapid pace. In April 2024, Gen. Stephen Whiting, commander of U.S. Space Command, described China’s progress as “breathtakingly fast.” China established its own military space corps in 2024, further intensifying concerns over a potential arms race.
International Reactions and Diplomatic Tensions
Russia has responded to the U.S. announcement with calls to prevent an arms race in space. Deputy Foreign Minister Sergei Ryabkov stated that Moscow believes there is still time to negotiate a legally binding treaty to outlaw the deployment of offensive weapons in space. Ryabkov criticized Western nations, including the U.S. and UK, for historically opposing such treaties, accusing them of using “spurious arguments” to avoid negotiations. He emphasized that Russia has long advocated for a treaty to rule out the use of force or threats against space objects, but noted that the U.S. had not formally notified Moscow about its new orbital weapons.
Policy and Legislative Context
The U.S. Space Force’s expansion aligns with broader military and legislative efforts. In August 2024, then-President Donald Trump proposed creating a Space National Guard, though the Space National Guard Establishment Act of 2025, sponsored by Sen. Mike Crapo (R-Idaho), failed to pass Congress. Meanwhile, the UK’s Space Strategy explicitly frames space as a critical domain for national security, with global space and satellite services supporting 18% of the UK’s GDP.
Implications for Global Security
The militarization of space raises significant concerns about escalating tensions and the potential for conflict beyond Earth’s atmosphere. The U.S. and its allies argue that defensive space capabilities are necessary to protect critical infrastructure, including GPS, communications, and early warning systems. However, critics warn that such moves could trigger a destabilizing arms race, particularly as nations like China and Russia accelerate their own space military programs.
Analysts note that the economic stakes are substantial, with the global space economy valued at nearly £500 billion. Control over space assets could determine the outcome of future conflicts, given the reliance of modern economies on satellite-based services.
What’s Next?
The U.S. has not specified the exact nature of its on-orbit weapons, nor has it detailed how they will be deployed or integrated into broader military strategies. The Pentagon has indicated that further details will be shared in the coming months as the Space Force’s expansion and modernization efforts progress. Meanwhile, diplomatic efforts to establish international norms for space militarization remain in early stages, with Russia advocating for a treaty while Western nations have not signaled immediate support for such an agreement.