If you read the Constitution, you'll see that the Second Amendment states "the right of the People to keep and bear arms shall not be infringed." There's been some argument over what these phrases mean, but it really seems to be common sense to me. The current federal law permits people to keep their guns while traveling in national parks, but it denies them the right to bear, or carry, guns on federal land. Each federal employee takes an oath to defend the entire Constitution, not just parts that individual likes. I suggest that if the NPS wants to keep people from carrying guns on federal land, then the Constitution, specfically the Second Amendment, needs to be amended, not ignored.