The US has the most expensive military in the world. Tajh Payne/US Navy via Getty Images The International Institute for Strategic Studies compiled data about the world's military budgets. The top militaries spend hundreds of billions of dollars on defense, with the US leading worldwide. President Donald Trump has proposed increasing annual defense spending to $1.5 trillion. Global military budgets in 2025 totaled $2.6 trillion. The US accounted for more than a third of that total. The US has