Just a heads up, non-citizens cannot become officers or warrant officers by federal law. If you want to enlist, you must be either a citizen of the USA, or be a lawful permanent resident and possess a valid "green card". When you do visit the USA, I hope you have a good time. I do not know all the information that you would need, but you could send an email or try to schedule a call with a recruiting office in the area in which you plan to visit. Best of luck.
Google NRD Los Angeles, you should be able to find a recruiter to talk to.I am a US citizen, Just never been to the US, Filipino-American, passport and all
I had all my stuff submitted internationally (Europe) so it is definitely doable but you need patience to figure out "out of the box" solutions in regards to logistical stuff and documentation. COVID is not making things any easier that's for sure.
Just taking a guess here, you will definitely need to have a good explanation on why you'd like to serve having never lived in the States. If the job needs clearance that also might delay/complicate things.