FIRST Swear an Oath to Protect and Defend The Constitution?

Is it True that as a Peace Officer anywhere in the United States, You must FIRST Swear an Oath to Protect and Defend The Constitution?

How can This Possibly be True?

I had heard that if you were a Constitutionalist, one in Support of the Constitution that you were on a Terrorist Watch List. Does this Mean all Peace Officers, Police are Terrorists?
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I really don't understand all this. I get very confused when it comes to be a law abiding citizen, those who follow the constitution, those who call themselves patriots and how that all fits into the Homeland Security watch of Possible Terrorist.

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If you Love your Country, then how Does that
make you a Suspected Terrorist?

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I Just Don't Get it.

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