It depends on what level of clearance you are talking about. You wouldn't need an SC to get on DII Restricted. We are the only one of the 3 services that SCs everyone.
When it says 'Completed' it doesnt neccessarily mean its been cleared etc, I rang up my Careers advisor yesterday as mine changed from 'In Progress' to 'Completed' within a week which I found near impossible, and she said that it still will be in the process of being signed off
I check daily.
The problem ive got is they've decided they want my medical records.
Came across as a bit strange as this is my second clearence and they didn't want it the first time and nothing's changed since my first clearence