Welcome ashdown. I can say with certainty that gov't employees cannot do that, but it may be different for the military - although the documentation leads me to believe you cannot make a rollover while still in the military...
Are there any limitations on making withdrawals while still in service?
The TSP is a long-term retirement savings plan that provides special tax advantages. Limitations on in-service withdrawals help ensure that retirement savings will be used for their intended purpose. Therefore, TSP participants who are still members of the uniformed services, including those employees in non-pay status, are limited to the following two types of in-service withdrawals:
When you make an in-service withdrawal, you cannot return or repay the money you remove from your account, so you permanently deplete your retirement savings and future earnings on the amount withdrawn. If you are in pay status, before making an in-service withdrawal you should evaluate your options to see if a TSP loan would be more beneficial. (See "
TSP Loan Program.") If you have an outstanding TSP loan, making an in-service withdrawal will not eliminate the requirement to make loan payments. (
Note: If you have tax-exempt money in your TSP account as a result of contributions from pay earned in a combat zone, when you make an in-service withdrawal, the money will be taken proportionally from the tax-deferred and the tax-exempt balances in your account.)
What are the rules for an age-based withdrawal? 
Although few uniformed services members will serve beyond age 59½, if you are an active member of the uniformed services at or after age 59½, you can make a one-time-only withdrawal of all or any portion of your vested account balance. (If you have a uniformed services and a civilian TSP account, you can only make an age-based withdrawal from the account(s) associated with your current employment. If you are in Federal service and the Ready Reserve, you can make an age-based withdrawal from each of your TSP accounts.) Your request must be for at least $1,000 or for your entire account balance (even if your balance is less than $1,000).
If you make an age-based withdrawal from a TSP account, you will not be eligible for a
partial withdrawal from that account after you separate from service.
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