My own personal battle cry will tell you my answer.
" FOR GOD AND COUNTRY "!
Yes I do, and yes I use to.
You serve God First, then Country. Do you impose your beleifs on others? Or do you allow your beliefs to form your conscious in the way you interact with others?
Your country allows you do do the latter, and asks that you not do the former. If you follow those rules, you can have your cake and eat it too. The quakers were no less Americans because they refused to pick up a gun. But they served their conscious and their country in other ways, proving that they were the equal of any other Americans.
It is sad that we are even having this discussion, as it should never come down to that question - except when your faith dictates you must break the laws of the land. And other than cults, I know of none that do.