Just a question, could I, as a senior member, wear the ribbons I earned as a cadet, specifically cadet achievement ribbons?
CAPR 39-3 is your friend.
You wear your highest cadet achievement (including moving the COS star from the Mitchell as appropriate) (See page 9).
You may also wear any service ribbons that are also on the senior list, though Recruiter, for example,
has a different standard.
The McChord Rack Builder for Senior Member Ribbons (http://www.mcchord.org/rack_builder/check_sr.html) is a great tool for figuring out which ribbons are authorized and their proper order of precedence.