In some jurisdictions, yes.
A typical security guard is not allowed to carry a gun. There are security guards that carry guns, but they must get additional permits and training for this. Guards without guns can do what is called a private arrest. Security guards with guns generally work for the government, military, casinos or some other money bearing entity.
Some security guards have- and do- carry guns. Going back to the days of stage coach guards "riding shotgun", bank guards, armored car guards. The security guards at nuclear plants today are armed. SOME security guards are not armed. The answer to your question would be "Maybe".
Some do, some don't.
Police officers, game wardens, security guards.
rules or regulations applaying to security guards from the Ontario statute regulating security guards
Before We Were Security Guards was created in 2004.
The rules on whether security guards are required to carry guns varies from state to state and job to job. When applying for a job as a security guard you will be able to find out if this is a requirement of that particular role.
Colleges most certainly offer security guards services. Pretty much any major institution or company should and most likely will have security guards services.
Really!? Security Guards