National security is always and issue in the United States. Here are the aspects and questions to address for this essay:

Identify a current policy problem for American national security, and then state a preferred policy solution to it and why it’s preferred (This is your thesis statement).
Briefly explain two competing solutions to this problem while addressing the responsibilities of each level of government (federal, state, and local) and the three branches of the federal government (executive, legislative, and judicial).
Build the argument for why your chosen solution is preferable, what critics say about the solution, and finally why the critics are wrong.