Thank you for your service!
I did 5 and one month active in the USN. MM under the nuke power program it was a lot of school which my young self had no need for, I put no effort into it and failed out. The advanced rate and the 3 weeks stuck at school added my the 13 extra months. I hated the military life, but loved the travel, my 2 West Pac cruises are some of the most vivid/best memories of my life, (seems strange because alot of it was as the stereotypical drunken sailor). I also really loved being on my ship, grew a fond attachment to that old girl (I get very attached to mechanical things), makes me a little sad to think she's laying on the bottom of the Pacific. I gave a brief thought of re-upping, MM was a critical rate at the time (very nice re-enlistment bonus), I had plans to spend a chunk on down payment on a new dually pick up truck, ( all you old people save your breath about wasting it, it never happened).
I had no plan when I got out. I floated around ended up going to school and getting my FAA airframe and powerplant license. Then I became a truck driver. Could have saved my self the aggravation and did another 15, and still be a truck driver with a "F... You" check every month to keep a mouthy dispatcher in line.
My advice is to do the second half. Get the pension. I know it's not a dream job, but none are, and at least it has a end point.