No, you only have a basis in the traditional IRA if you made after-tax contributions. Traditional TSP and 401(k) are pre-tax accounts and therefore your rollover to the traditional IRA won't cause a basis in the traditional IRA.
It is best if you keep track of the Roth IRA basis yourself but if it is incorrect in TurboTax then you can edit that information. For your information once you are over 59 1/2 you don't need the contribution information anymore, because your Roth IRA distributions will be a Qualified Distribution and your Form 1099-R should have code T or Q. Qualified Distributions are not taxable.
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