I've honestly no idea if Uprising is going to be using pre-established canon set up for Pacific Rim. Marshal and Ranger likely still exist considering cadets are a thing.
As far as Nate Lambert's article is concerned, that's poor wording on my part.
So far as I know, from the information they've provided, Nate holds the rank of "Major" (his badge says as much). But whether or not "Major" is a rank that was given him within the PPDC, or if he served in the military beforehand, is pretty unclear, so I'll just make a note of that in the trivia section.