Limited Edition Content Questions

For those that have the limited edition, a few questions. In the booklet assigned to Gabriel Thorne, on the first page, Palmers personal message to him talks about how the UNSC still sees Spartans as a military project despite full transparency. I found this interesting considering the beginning where a UNSC operative is questioning Halsey on moral ethics of the Spartan programs of old. What did you guys think?

Also, on the very back, I find it interesting that Thorne noted not many know about the origins of the Spartan IIs and IIIs. Is the UNSC solo trying to keep everything under wraps for some reason?

The last thing I wanted to ask was about the note from Hoya, not sure who that is, maybe another Spartan, one of Thornes friends, not sure, but the letter talks about two operatives and their duty to the Infinity, not sure what to make of it, or who the sender or recipient could be, any ideas or insight?