Why is it necessary for police to wear their work uniforms when marching in the Pride Parade? 

McDonald's and Tim Horton's restaurants must have LGBT employees.  Do they march in the pride parade wearing their work uniforms?  

There must be LGBT nurses and other health-care professionals.  Do they wear their uniforms and/or their "scrubs" while marching in the pride parade? 

What about professional (and non-professional) sports teams?  Do their members of the LGBT community wear their uniforms when they march in the pride parade?