The United States of America spends significantly more in absolute terms on its defense than any other country, and this has been the case since World War II. In 2017, US military spending accounted for some $610 billion, 35% of global military spending in that year.
As of Q2 2021, the government had allocated $628.6 billion dollars to the national defense, 12.5% of the total budget. However, as the US military pulls out of Afghanistan and seeks to remove all personnel by September 11, 2021, the total military expenditure might decrease heading into next year.
Related Questions:
Will any country's military expenditure exceed that of the United States before 2030? by Jgalt
What will be the total expenditure on the military in the US, in billions USD, in 2022?
This question will resolve as the total amount in billions that is spent on national defense according to the federal budget. USAspending.gov can be used as a reliable resolution source, providng historical data and budget breakdowns by month.