[fffggg]

Military spending as a percentage of GDP only decreases if you don't count military spending outside the DoD's official budget -- which is why it appears to have shrunken when it actually has not.

For example, 50 years ago veteran's benefits were part of the DoD budget. Today, they're part of the healthcare budgets. VA spending accounts for 20% of all government health spending -- and has grown astronomically over the last decade. It's huge.

I urge you to take a second look at the numbers you're quoting. Specifically, consider how much of the "healthcare spending" increase is actually a hidden increase in military spending which has been quietly shifted into a non-military budget.