Practical competition is open to all reputable persons without regard to occupation. It may specifically not be limited to public servants.
USPSA Handgun Competition Rules
PRINCIPLES of USPSA Competitions
[A reminder for those wishing to become oppressors. Government employees are servants. The way they are kept servants is by the people refusing to allow their right to own and use guns to be infringed. Reminding the servants of the skill of the people is a part of keeping the servants in line. The USPSA is part of that.–Joe]