"...Like all 401(k) type plans, the TSP provides spousal rights for spouses of employees and retirees. Interestingly, the rights granted to the spouse are different depending on whether the employee/retiree is covered under CSRS or FERS.
Under FERS, unless the spouse waives his or her right, they are entitled to receive a specific type of TSP annuity (i.e., joint-life with a 50% survivor benefit and no additional features). There are many different options offered in the current TSP annuity (which is offered by MetLife) and, in my opinion, this spousal default choice is one of the least appealing..."