This is a repost as my previous one on this topic was mysteriously deleted. I don't intend this post to dissuade anyone from joining the Coast Guard; I'm simply relaying my experience. I'd like to thank all users of this site especially those who regularly answer questions. I spent tens of hours over a period of years reading through posts, which helped me to make an informed decision on attempting to join.
I started the application process to become a reservist for a PSU (Port Security Unit) at the end of November. I submitted my paperwork for review, and stated in the medical section that I was currently taking (and still continue to take) a pill daily to treat my hypothyroidism. I heard back mid January that I received a medical disqualification (DQ). The recruiter explained that currently, due to a lack of a strong need for personnel, few medical waivers are being issued to applicants who are on medication. If I had a simply had history of hypothyroidism without the current need for medication, it'd be much more likely that I'd be able to obtain a waiver.
Hopefully in the future, I won't have to actively take meds to treat the condition, then I can give the Coast Guard another shot. Best of luck to all current and future applicants!
Additional posts on hypothyroidism from uscg.org are below:http://www.uscg.org/Forum/aft/2935.aspxhttp://www.uscg.org/Forum/aft/7978.aspxhttp://www.uscg.org/Forum/aft/14380.aspx