I sincerely regret not signing on the dotted line for service in the US Army (and/or National Guard). I went through MEPS three times, DQ'd once, and the other two times (#2 and #3) I got cold feet. Trip #2 I had just graduated college and was entering the "real world", and had been married for 1 1/2 years to my wonderful wife. I was going to do the enlistment thing for 2 years then go OCS after the bonus period expired. I simply got cold feet and had heard too many horror stories as to getting the run around once in. On trip #3, my baby girl was not quite a year old and my son had just turned 3 years old. My wife was fully supportive. I went through MEPS that 3rd time and all I could think about was my family and me not being there. I was hounded by the recruiting Sgt, then a Cpt, then a Maj, and then a Colonel (for the OCS stuff). I received phone calls for 6 months after that third trip to MEPS. That was 2005.
Now... I regret not going. If you have any itch what-so-ever, do it. Do not be like me and fold to getting cold feet. Do it young, get in and get out, do your service to your country, state, etc, and then move on. My 2 cents.