Congratulations gun addict: I received my citizenship when I came back from Vietnam. (1970 I was in Vietnam in 68 and 69) The Army facilitated and paid 100% of the cost. I hope the Marines did the same for you.
I was teaching a US citizen only class for senior company grade officers. My Major asked if I liked my job, I said yes, Major says, here is your paperwork, do it or I will have to relieve you of your duties. Yes Sir! Never looked back.
Weapon? Remington 700BDL in .264 is what I have. Love it. excellent choice. (It was my understanding when I purchased it, that it was the Marine sniper rife at that time,,,even if I was Army super rifle.)