TVKNSC, it looks like you aspire to a 70/30 stock bond asset allocation but you've gotten yourself into a very aggressive portfolio. If my math is right, you look like you're 91% stocks, 9% bonds. I'm not including the $15K emergency fund in this, just the assets in the TSP, IRAs and the two Vanguard funds in your taxable account.
To get yourself to a 70/30 asset allocation, you can get close to that (72/28) simply by exchanging your Vanguard Target Date 2040 funds in both IRAs with Vanguard LifeStrategy Moderate Growth (VSMGX) which has the same funds at the target date funds, only at a 60/40 stock/bond ratio. That gets you to 72/28. With ongoing contributions, your AA will gradually change, though, so you'll need to make some adjustments every 6 to 12 months for the next year or two (depending on returns) before you can get into more of an auto-pilot mode.
Depending on returns, you'll soon get to 70/30 as your TSP contributions to the G Fund pile up. In about one year, your contributions will pile up and your asset allocation will get too bond-heavy. So, you can start exchanging from the LifeStrategy Moderate Growth into the LifeStrategy Growth Fund (VASGX), which has an 80/20 asset allocation. So, after one year, you might wind up holding half of your IRAs in Growth and half in Moderate Growth.
After two years, assuming no gains or losses (which of course won't happen, but we're just doing some forecasting guesses), if you transfer the remaining half of your IRAs from VSMGX (Moderate Growth) to VASGX (Growth), and contribute another $5,500 to each plus $17,500 to the G Fund, then you'll still be at around 70/30 with a total balance of around $195,000.
After two years of contributions, your bond allocation will continue to climb because you're loading up so much on the G Fund, so eventually you could get to this to keep your portfolio at 70/30 (shown in Row 72 of spreadsheet, see below):
* Hold enough G Fund (around $25,000 or so, whatever it takes to be 30% of the sum of G Fund + VTIAX + VTSAX) to complement your taxable holdings of Total US Stock and Total International Stock to compose a virtual 3-Fund portfolio from those three funds
* Shift the rest of your TSP balance into a L Fund with a 70/30 AA (L2030 comes closest)
* In your IRAs, select the appropriate target date funds in your IRA that is 70/30, or else hold a mix of LifeStrategy Growth and Moderate Growth -- enough to get you to 70/30 in your overall portfolio
With the portfolio described above, after 2 years of contributions and depending on your gains/losses, you'll be on more of an auto-pilot mode where your three single funds (G Fund, VTIAX, VTSAX) can make up their own little 3-Fund portfolio, while the remainder of your TSP and your IRAs can be in set-it-and-forget-it all-in-one funds that match your desired AA. Until you get to that point, you will need to do a rebalance every 6 months or so.
To keep VTIAX and VTSAX in balance to keep your desired 70/30 US/International ratio, I recommend you NOT reinvest the dividends from these funds. Instead, direct the dividends to the Vanguard money market fund and then reinvest them into whichever fund needs the money to keep your desired asset allocation between US and International. It's not that important to keep them perfectly balanced, just do the best you can. US and International stocks have a pretty strong correlation (similar returns) anyway, so they will probably stay relatively close to each other. You'll probably wind up needing to direct dividends to Total US Stock Market, because the ratio between US and International right now is 56/44. So, this means that your international holdings are a bit more than 30% of stocks.
I computed this in a Google spreadsheet
that you can take a look at.
I hope this makes sense and please reply if you have any questions.