Trump wants Congress to approve $1.5 trillion for defense.
This is his biggest defense request in decades.
Nondefense spending might drop by 10%, with more on state and local shoulders.
The Pentagon's last pitch was $200 billion for wars and supplies.
Trump's tax bills added $150 billion for the military.
The nation struggles with nearly $2 trillion deficits; debt tops $39 trillion.
About 66% of $7 trillion annual spending covers healthcare and social security.
Trump's budget reveals priorities but doesn't equate to law power.
Debt oversight is a hot topic as Congress fights over spending.
Key action: Watch for Congress's decision on defense spending hikes.