The official term are in Block 19 "Service Member has not completed first full term of service", Block 24, "Uncharacterized" and Block 28 "Entry level performance and conduct".  Another point in the DD-214 is that in Block 25 says "he was discharged under the authority of AR 635-200 Chapter 11.  That means he was found to be unfit to remain in the Army and was dicharged for the good of the service."  Which you can find it here http://dont.stanford.edu/regulations/regulation27.pdf