I do.
I've paid into Medicare for decades as I've worked. Medicare has been so bad that many physicians opted out of it until they couldn't any more. At some point, if I ever opt out of the work force, I'll apply for Medicare and recoup some of my investment, though I'll also pay for a supplemental policy for which I'll probably pay more than I'll ever recover in benefits from it. (Not that I'm complaining. Not using insurance is a good position to be in.)
I've also paid Medicaid taxes for decades. Medicaid takes care of those in need of medical care who cannot afford it. Medicare will claw back every dime it spends on you if you have any property though.
As for Tri-care, that's largely a benefit due service members, though they pay nominal fees for coverage.
Now, perhaps the next question should be: Do you know how Obamacare is managed?