If you are giving any thought to TSP allocations you aren't that lost! You are off to a good start with a CSI 60/20/20 allocation. It's really up to you and your risk tolerance what you want to do with the G fund. I have always kept a small percentage (around 10%) in the G fund. It is pretty easy to transfer money between funds, so if you want to transfer it you can always move it back. However, I would advise against moving money around too often, best just to make a decision and stick with it (besides occasional rebalancing, if you want to do that). Make it your goal to increase contributions by 1-2% (or more) each time you get a raise, whether for a promotion, annual COL adjustment, or years in service. Ultimately try to max out your contributions!