To become a licensed Security Guard in Connecticut means to obtain a Security Officer Certification Identification Card.
Getting this Security Guard license is a little different than other states:
The security application is not publicly available
To get an application for a CT Security Officer Certification Identification Card, you need to take a government approved Security Guard licensing course. Your security course instructor will actually be the one to provide you with the license application.
In CT, the government body that controls a Connecticut Security Guard's license is the Department of Emergency Services and Public Protection.