Some thing I think you are missing is that these weapons and men you think we need to protect our country from attack by a foreign country, are the same weapons and men that our govenment is using to attack us(drug raids, waco, elian gonzalas, irs raids). Also this force is being used around the world to beat up other countries that don't behave the way our government deciedes they should. If I don't like what is being done by the government and don't wish to support it, and I stop paying taxes, they will send those defenders of our country to come take my money at the point of a gun.
It was also mentioned that we don't need income tax, that the government can tax imports and have sales tax. What if I want to sell something, and I don't want to send a portion of the money to government? It is my property, why should the government get some of it? If I don't send it in, the government will still come get its money(formally my money, but the god 'government' has decreed that it deserves a portion, and demands immediate obediance, at least the christian god waits until we die to inflict a punishment, our new god isn't that patient).