Nobody can give a precise dollar-number to U.S. ‘Defense’ spending because the U.S. ‘Defense’ Department has never been able to pass an audit, and is by far the most corrupt of all federal Departments (and is the ONLY Department that has never passed an audit), and also because much of America’s military spending is being paid out from other federal Departments in order to keep down the published annual U.S. Government ‘Defense’ expenditure numbers (which come from ONLY the “U.S. ‘Defense’ Department). Those are expenditures for America’s privatized and overwhelmingly profit-driven Military-Industrial Complex. (By contrast: Russia and China require, by law, that their armaments-firms be majority-owned by the Government itself.)
According to the best available estimates, the U.S. Government has been spending, in total, for over a decade now, around $1.3T to $1.5T annually on ‘defense’, and this is around half of all military spending worldwide by all 200-or-so nations, and is more than half (around 53%) of all of the U.S. federal Government’s ‘discretionary’ (or congressionally voted for) annual expenditures.
Unlike regular manufacturers, which sell entirely or mainly to consumers and to businesses, not to their Government, armament-firms need to control their Government in order to control their markets (which are their Government and its ‘allied’ Governments — including NATO), and so they (in purely capitalist countries such as the U.S.) do control their Government. This is why the armaments-business (except in countries whose armaments-sector is socialized) is infamously corrupt. In order to hide the extent of that corruption (and to promote ever-higher military spending), the ‘news’-media need — in those countries — to be likewise effectively controlled by the investors in those firms.