If you are still experiencing any issues connecting with squad, please unsubscribe to all 29th related mods you have for the game. Then only subscribe to the three mods with this link.
https://steamproxy.net/sharedfiles/filedetails/?id=2100945221

Make certain to test it with an empty 29th server before your next official drill. I still had trouble with mine that didn't go away until I restarted.

If you cannot connect after all of this, please inform Cpl. Hussey and myself.