Per the language in HR 218, now 44 USC 18:
(c) As used in this section, the term `qualified law enforcement officer' means an employee of a governmental agency who--
(1) is authorized by law to engage in or supervise the prevention, detection, investigation, or prosecution of, or the incarceration of any person for, any violation of law, and has statutory powers of arrest;
(2) is authorized by the agency to carry a firearm;
(3) is not the subject of any disciplinary action by the agency;
(4) meets standards, if any, established by the agency which require the employee to regularly qualify in the use of a firearm;
(5) is not under the influence of alcohol or another intoxicating or hallucinatory drug or substance; and
(6) is not prohibited by Federal law from receiving a firearm.
In WI no, they are not LEO's. At least not in my area. The State of Milwaukee or the Democratic People's Republic of Madison might do things differently.
Ya'll stay safe.