Title: What You Don't Know (But Should) About Your Thrift Savings Plan
Article Snip: "...You can have both a traditional and Roth TSP at the same time, and there’s an interesting caveat: the government’s matching contributions can only be made into a traditional TSP, so even if you only contribute to a Roth TSP, you will still have both types of accounts (and the added benefit of some tax diversification)..."
Reference: www.forbes.com