Retirement benefits for career feds and military personnel will be based on their length of service and salary. Unlike the vast majority of private pension plans, the federal-military programs are protected from inflation. Benefits will come from three sources: The federal/military annuity or retired pay, Social Security and the TSP. Which makes it so important to everybody. The TSP could supply one-third or more of the spending money retirees will have.So far, so good! But every top has a bottom, right?Arthur Stein, a D.C.-area financial planner, has been tracking the TSP for clients for decades. And several of his clients are self-made TSP millionaires. He urges people to invest for the long haul. And avoid what he believes is risky behavior: when clients have too much of their retirement nest egg in the G fund. Which is what we’ll talk about today when he’s my guest on Your Turn.