This is a samurai hairstyle, notice how the bun is placed high on the head. For the Samurai hairstyle to work best, I recommend you not to have over 8 inches of hair (check out my hair length guide) because you want your bun to be thin and blend in nicely into the contour of your head.
The TSP's core menu includes an S&P 500 index tracker (the C fund), a small-cap stock fund that tracks the Dow Jones U.S. Completion Total Stock Market Index (the S fund), an international-stock fund that tracks the MSCI EAFE Index (the I fund), and a Barclays U.S. Aggregate Bond Index tracker (the F fund).
How can I use the C Fund in my TSP account? The C Fund can be useful in a portfolio that also contains stock funds that track other indexes such as the S Fund (which tracks an index of small U.S. company stocks) and the I Fund (which tracks an index of international stocks). The C, S, and I Funds track different segments of the overall stock market without overlapping.