Don't know the answer to your questions, but here's some food for thought. I know a lot of Nepali who have joined the US army through MAVNI, but I have never met anyone who did it for any reason other than getting a US Greencard (and citizenship). Just let that sink in for a minute: most Nepali realize that joining the US army is an option only when no other option exist. You, on the other hand, already have a Greencard. Having said that, to each their own. Hopefully, other folks will answer your question. Good luck!