Nothing changed. You can do this with a dummy echelon instead of a second real echelon. 

Chapter 2 starts off as a slight increase in difficulty, enemy power wise. However, overall they're still pretty easy. Except 2-4. Fuck 2-4. Oh, and all of the maps are at night. Fun.

No changes.

I do use a dummy echelon for this. No other changes. 

Nothing changed for this map.

Operation deep dive, the second real major operation (Cube doesn't count, I swear). We're looking at three chapters and 4 maps per chapter worth of brand new content. It also features the second ranking map, in which you'll be assailed by the bosses of the operation, plus some extras while defending a supply route to your HQ! All for a grand prize of a unique equipment for 9A91. Yes, you do want to get that. 

Apparently, I also have to explain how voices are added to this game too.

With Arctic Warfare finally over, the first thing most people are concerned about right now...is how to prep for the next operation. Fancy that. Well, Deep Dive is the next major op up on the list. And, oh boy, does it shift the priorities for things to have. (tldr at the bottom)

Chapter 6 is where we'll start seeing proper bosses at the end of each chapter. In this case, Alchemist is the boss. You'll also be able to pick up M16's unique equipment, an exo-frame armor thing. It's pretty good, but not super important to pick up. It does, however, give her a good boost as a corpse-drag tank. So if you're into that, the importance of getting it might be much higher.

So, here we are. First ranking event for EN GFL. Arctic's ranking event is probably the easiest and most boring of the ranking events. The goal for these ranking events is to get a high score on the hidden map of the event. Points are gained by defeating various enemies that spawn in the map, however, you lose points for repairing or losing any units. Thus, to put it simply, to get a high rank you need to kill as much as you can without any losses or repairs.