TSP Outlines Strings Attached to Upcoming Investment ‘Window’
This link explains the rules for the forthcoming “window” that will allow some TSP investors to invest in funds outside of the traditional TSP funds. Personally, I think this is a bad idea as you really don’t need anything beyond the funds that are already available and there are a bunch of fees you will be paying, as you can read here. If you want to invest in other things, do it in your IRA, other retirement accounts you have access to, or taxable brokerage accounts at Vanguard, Fidelity, etc.:
Joel Schofer's Career Planning Blog 