Don‘t quote me on this, however, members of the CF all undergo, at minimum, the "enhanced" clearance for security purposes, the same as any other Federal government worker.
Enhanced is simply a reliability check involving a CSIS check to see if you are a known terrorist, and ensuring your address and job history is complete with no gaps. There MAY be a credit check, to ensure no outstanding or recent bankruptcies.
"Secret" is the next level up, and involves a slightly lengthier check, of police databases, and for certain the credit check.
All I know about "top secret" is that most people don‘t have it, it takes a long time to get, and they are in fact, VERY thorough.
I believe "secret" clearance is mandatory for a comms course.
The exposure an "enhanced" level employee/soldier has to sensitive data is quite limited. The secret Tim Horton‘s coffee recipe is off limits, I‘m quite sure...
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At most, you will handle information such as records regarding other employees/soldiers, such as training or attendance records, PRI/SN‘s, etc. ("protected a" and "b" stuff). You don‘t get into anything interesting or remotely risky until "secret" level.
I‘m sure an INT pers could correct me or fill in details.
I have only applied for Secret once, for an intelligence job with my civvi employer (customs), and since I didn‘t get the position, they didn‘t send the check in. I‘ve done that security check so many times it‘s ridiculous.