When you start in 4th Fleet, it's after you finish training. 4th Fleet is not a training plot. Having an untrained Marine is a danger to both himself and the unit.
You will have to choose 4 (four) skills to replace if you're going to be a Marine in 4th Fleet. There's no easy way to "slide in," sometimes, you just gotta jump into the cold water at the deep end and depend on your own writing skills and the players around you. Daunting as it is, the awkwardness disappears faster, especially once the proverbial bullets start flying.
As a Freespacer who has stated his own unfamiliarity with Nepleslia, the characters will know to be more careful. Also, 4th Fleet is tailored to be able to work new players into the Nepleslian setting.
Next, your inventory. It appears to be the inventory for a Navy sailor, not a Marine. I don't see the green uniforms and proper headwear listed.
His rank is listed, at the bottom, as a CtR. That's a Navy rank. Marine starting characters are Private Third Class (P3C). Contrary to the name, 4th Fleet is a Marines only plot. It is not designed for Navy characters. The Naval element of the Fleet, while the larger component, is controlled by the GM.
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Many view him as crazy, but that's because he kinda is...
Dislikes: Irrational people, reminders, restrictions, people who don't think for themselves...
insecurity, and closed-minded people
Is the irony deliberate? Crazy person doesn't like irrational and close-minded people?