I had a "herniated" disc while I was still in ROTC and missed FT that year. Was bed ridden for almost a month, shitty ROM and couldn't stand or sit. Got an MRI and did PT for a while, acupuncture and eventually it healed up fine.
When I went to IFC a few years later, I found out that what I had could be disqualifying, until they still passed me. They DQ'd another guy I knew with the same problem. I found out later that my official diagnosis in my initial plethora of paperwork that was submitted was this "radiculopathy" that deaddebate mentioned. Guess the doc at the time didn't want to bother defining it to me so just called it a herniated disc.
Try to do less invasive solutions first, and get it healed up. You're going keep your back beyond your years in the mil. Good luck.