I assume you are getting severance, or retirement? Which is it?
They generally take it from your final pay which was mentioned. What do you owe this money for? If it is for TA-50, were you MEDEVAC by any chance?
I had a statement of charges for missing TA-50 totaling almost 1K. In my WTU, the finance civilian pointed out to me I couldn't be charged for this gear because I was MEDEVAC. She called the WTU commander and sent a memorandum over to her stating this. The CO signed it, sent it to finance and I was cleared.
If you are medically retired, the statement of charges can also be arranged to be paid back over 12 months. If you are uncomfortable with giving specifics in here, IM me and I will help you. I learned a ton about this stuff.
Joe