[RR691983]

AR 635-200 covers enlisted seperations. SPD is the acronym for Seperation Program Designator. It is the codes used to show why someone is seperated from service. JFT is the code for failure to meet Physical Standards. This could be many things, most common is failure to meet the Army requirement for the APFT. JFT falls under this descriptor:

"signifies involuntary separation for failure to meet established physical
readiness standards but do not identify a specific existing reason for separation. They are
included in the Army SPD inventory for possible future use should the need arise.
Instructions for use will be provided by HQDA message or other directive announcing
implementation."

Basically, I can't really tell you what was wrong with him all I could do is guess. It could've been a number of things. I wish I could answer better than that...