other issues - Veterans Administration budget is always not calculated as part of defense spending, because they are separate agencies. So when people say military budget they may be keeping that separate, however putting them together of course increases the amount spent
I happen to believe this document on money more than others, because publication controlled by congress and not the executive.
Atlas of Military Compensation (Biden) https://www.cbo.gov/publication/59475
If we also ask congress for Scientific research funding https://www.congress.gov/crs-product/R48307 (also under Biden)
about 50% of the 0.6%-0.7% of GDP it reports is to the Department of Defense.
The military industrial complex is getting money from all sorts of things that we describe as separate, but are really part of it.