In 2003, the U.S. military invaded Iraq, although that country posed no threat to our national security. Then, last year, we got involved in Libya's internal revolution. Etc. And now some people on both sides of the aisle appear open to taking military action against Iran.
This is not defense, it is aggressive offense.
So, until those in charge stop engaging in unnecessary battles and wars of aggression, perhaps the "U.S. Department of Defense" should be renamed to "U.S. Department of Offense".