Okay, as a retired guy who actually did a 'fair bit' with the uniformed services TSP
On matching - the law is actually that the services are authorized to offer matching, such as part of a retention policy, but are not required to. There's not even a 'should' for it. I am unaware of any significant interest by service members to have matching, as opposed to regular bonus pay and such. We tend to be short-sighted that way. Thus, no real prospect of that option being used in the current atmosphere.
Other thoughts: While a 401k is the closest program that the TSP can be compared to, it is NOT a 401k program. In many ways it's more limited(many 401k programs offer more funds, for example), but it has some very nice advantages. For example, the ability to borrow up to half the money in the account for a down-payment on a house, at incredibly low interest rates that you pay yourself. Or even for any reason at all. Pay back over the next 15 years or so. Or 'any reason', though the amount is more limited and you only have 5 years to repay that.
*payments back not being included for ease.
Ben - TSP availability is closer to 16 years than 6. I know I started my 10% contributions way back when it became available for uniformed members.