State income tax rates vary widely from state to state. South Carolina has the lowest marginal tax rate at 0% for the first $2,850 of personal income, while California has the highest marginal rate of 13.3% for the portion of incomes over $1,000,000.
DoD: The Department of Defense is basically the US military: the Army, the Navy, the Air Force, and the Marines. They defend American sovereignty by using guns and bombs in open and direct conflict.
The U.S. intelligence community is vast, composed of 17 distinct organizations each operating under its own shroud of secrecy. Oversight of these agencies generally falls to the Department of Defense or Congress, leaving the average citizen with precious little knowledge of how they operate.