Lol, then you've just shown how limited your knowledge of the USN and the USNR and the enlistment alternatives of the past is. It was a USNR enlistment for six years total with two years active, very common in the 1960s and 1970s, and maybe after that,and pre-DA/DT. There, you learned something.
I was the sonar officer and the enlisted guys went to so many schools before coming to the ship most were e-4s and had 6 year enlistments to start off if you can believe that.