This really scares me to say but for once I agree with Obama, (truly we must be in the end times now) our police are not the military. While some of the equipment has valid uses, when I see police in camouflage uniforms that are identical to an army soldiers I am uneasy with it. I think the exact opposite of a federal police force here. How often in situations does a federal agency (FBI for example) take over a situation? The officers are no longer under the local authority but federal, hence a federal police. While this may be stretched some, I don't think it's far from the truth.
We already have a "federal police" they are the US Marshals, FBI, ATF, and Homeland Security.