lumydee
Now He already have glass maybe He can build some green house because it Will help him when winter is coming. And maybe He can teach how make perseved food like salted fish, smoked meat, becon and dried vegetable. It is simple but useful in winter. He can also develop Charcoal and make Charcoal Block.
I think the author has misunderstanding regarding military ranks! Warrant officers are commissioned officers, that means that they became an officer bcuz of their skills rather than the normal promotion. Like, if a pro doctor joins the army he or she will be given a rank of warrant officer. I think that's what it is,,,, Probably..... Maybe!!