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The announcement by US Secretary of Defense Pete Hegseth regarding a six-month review of military forces in Europe reflects a culmination of longstanding tensions within NATO about burden-sharing and collective security. Historically, the United States has maintained a significant military presence in Europe since the end of World War II, primarily to deter Soviet aggression during the Cold War. This commitment has been underpinned by the principle of collective defence enshrined in Article 5 of the NATO treaty. However, in recent years, particularly following the 2008 financial crisis and the subsequent rise of populism, there has been increasing pressure on European nations to bolster their defence spending. The 2014 NATO Wales Summit established a benchmark for member states to allocate at least 2% of their GDP to defence by 2024, a target that many allies have struggled to meet. Hegseth’s remarks come at a time when the US is also engaged in a contentious military campaign in Iran, further complicating its strategic calculus in Europe. The implications of this review are significant not only for NATO's cohesion but also for the broader geopolitical landscape in Europe. A reduction in US military assets could embolden adversaries such as Russia, which has been increasingly assertive in its foreign policy, particularly in Eastern Europe and the Arctic. The ongoing conflict in Ukraine serves as a stark reminder of the potential consequences of diminished US commitment to European security. Furthermore, the review could exacerbate existing tensions within the alliance, as countries like Germany and the UK may find themselves under increased scrutiny regarding their defence budgets and military capabilities. The potential for a recalibration of US forces could also impact defence industries across Europe, particularly in nations that rely heavily on US military contracts and support.