Welcome, Mciws!
It appears that you cannot continue to contribute to the TSP after leaving active duty.
I had to hunt for it, but TSP Bulletin 02-U-20:
When a Thrift Savings Plan (TSP) participant separates from the uniformed services, service representatives must give the participant a TSP withdrawal package and submit an employee data record (06-Record) to the TSP record keeper to reflect the separation. In addition, service representatives should explain the TSP withdrawal options to the participant.
This bulletin lists the materials that should be included in the TSP withdrawal package after the new record keeping system is implemented in September 2002. TSP Bulletin 01-U-3, dated July 19, 2001, contains information about submitting employee data records to the TSP record keeper.
Link: http://www.tsp.gov/cgi-bin/byteserve...ns/02-u-20.pdf
Personally, I would roll it over to an IRA or leave the TSP alone and start other investments: 401(k), IRA, regular brokerage account, in that order.
Bookmarks