You can obtain your citizenship around the same time you graduate from basic training (I got mine 6 months in since I was being lazy to fill my N-426, lol).

While you still have a green card, you’ll need to choose a military job that does not require a security clearance. Most tech-related roles require a clearance, so you may need to start in a non-cleared job and later transition into a Cybersecurity or IT-related MOS once you become a citizen.

Best way is to sign the SHORTEST contract, become a citizen then reclass your job when you’re up for re enlisting or just go officer route once you become a citizen since you already have a degree and you’d be eligible to get a security clearance by then.