Chalmers Johnson and Robert Higgs were making the case as long ago as 2006 that the actual US defence budget was obfuscated and was over a trillion dollars.
They argue that if you add the budgets of the Department of Energy (nuclear research), the Department of Homeland Security, the defence-related programs of the the Department of State and international assistance programs (e.g. Israel, Egypt?), the Department of Veterans Affairs, NASA, the Department of the Treasury's military retirement costs (Military Retirement Fund) you can add 50% to the nominal defence budget.
They argue that if you add the budgets of the Department of Energy (nuclear research), the Department of Homeland Security, the defence-related programs of the the Department of State and international assistance programs (e.g. Israel, Egypt?), the Department of Veterans Affairs, NASA, the Department of the Treasury's military retirement costs (Military Retirement Fund) you can add 50% to the nominal defence budget.
[1] https://mondediplo.com/2008/02/05military
[2] https://www.independent.org/news/article.asp?id=1941