Please remember that the FEHB Open Season ends on Monday, 12/11/17. This also includes FSAFEDS, which doesn’t get automatically enrolled. This means you would need to re-enroll it every year.
With the possibility of government shutdown, you may want to get this done before tomorrow, Friday, 12/8/17. Visit https://fsafeds.com/ for re-enroll info and more.
Also, the deadline period for 2018 TSP election is from 12/11 to 12/22.