If your'e AF and PCS'ing to Italy, I can tell you what's required to get your F-body registered, As I just brought my TA here (Aviano AB) from the states.
-When you are outprocessing, get with TMO to set up your car shipment. It wont cost you anything. (you will have to drop it off to them about a month before you actually leave, so I hope you have another method of transportation.)
-After you get here you have to wait another month, as it takes time to ship it via boat into Germany, put it on a car carrier, then drive it to Italy, and process the car. (sometimes it takes longer, because they wait to get a group of cars going to the same location, then ship them)
-Before you go to pick it up, you have to get an AFI drivers license (pass a test during your mandatory newcomer briefings over the first week) set up your insurance (Italian insurance, USAA, or Geico) have them email a certificate to the Pass&ID office on base, they will do all the paperwork, collect a 5 Euro registration fee from you, and issue plates to you. (I would register the Ls1 as your "white plate" vehicle so you don't have to pay Italian "road tax" on it, because they tax according to engine displacement) and it would cost you around $1000 anually in road tax.
-bring your title or lien paperwork, AFI license, plates insurance info& certificate with you to go pick up the car, they will release it to you, then you have to have it inspected on base within 10 days. From what i've seen, it is mostly a safety inspection (lights all work, no leaking fluids, no bald tires, no exhaust leaks, etc.) I say "from what i've seen" because I pick up my TA next week, but i'll post back if any info changes from what i've posted. (i've got LT headers and no cats so i'm kinda interested how this is gonna turn out)
I wouldn't worry about tint here because I just bought a shitbox BMW that just passed the inspection, and it has like 7% tint on the back and all side windows.