On my recruit arrival proforma it's asking if my marriage certificate is in AF B9999 or not in AF B9999. I have no idea what this means and what my certificate Is in. Any help is much appreciated
If it says on the top right corner AF B 9999 then it should be at your unit in your unit/sub-unit Admin Office. Take it to them. If you are thinking about a private file with your certificates and stuff then that's fine, just keep hold of it. An AF B 9999 (also known as a Quad 9) is an official document and should not be at home.