There are potentially five different service computation dates that are used to determine your benefits as a federal employee with which you should be familiar. The author provides details about each one.
One advantage federal employees have when saving for retirement is the Roth TSP. A Roth investment allows you to pay tax on the seed (the smaller, starting investment) and reap the bounties (the investment plus growth/interest) tax-free. The author explains more about how this works.
If you are a federal employee with outstanding tax debts, you may find that money from your TSP account is garnished to make good on those debts.
The author offers an analysis of the L funds in the TSP as compared to other target date retirement funds offered by large brokerage companies. He points out the differences that federal employees should be aware of when investing in the TSP L funds.