Do the us navy or us airforce sign up non-us citizens?

im a graduate in medical field, i want to join the up the military,but im not a american citizen.. any chance i can get recruited?
Update: if yes.. what website can i go to for more questions? i have bachelors degree in medical technologist.. do they need them too? do i get a higher rank?
Update 2: im only here for vacation though.. i dont have a green card..but im still legally in the country though..
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