Why can't Jehovah's Witnesses serve as police officers?

[Jack Ryan]

...

[Evacuated]

I have known a few serving police officers. Some who were before studying. Another who became a police dog handler. Others who resigned conscientously.

There are conscience issues regarding an oath of allegiance, obvious issues around possibility of having to carry or use weapons, or using and facing of physical violence in effecting control and arrests.

One has to consider the secular demands of the job as policing is a 24-hr operation. There are obvious issues around militarism, patriotism, and the general social environment of such an intensive occupation. 

It would be interesting if there was a response from any JWs who serve or have served.