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A brief primer on the expedition system

Why we ask you to do what you do.

Assault rifle/SMG formations aren't just your bread and butter, but also half the toppings. You're going to use them a lot.

Unlike rifle echelons, which come in many forms, MG echelons are relatively straightforward: They mow down enemies. Ideally really quickly, because they have limited magazine sizes and are sitting ducks while they reload.

Due to popular demand, here's a leveling guide. Starting with the normal leveling process, then onto other special methods of leveling. 

Because I seem to answer this question constantly despite the sources on them, a quick guide to completing the kill based weeklies:

Before we get into the details of how calibration and enhancement works, let's first get around to how to unlock them. Both functions are accessed from the research menu, which you unlock at Commander Level 12. After that, you need to complete World 1-4 Night for Enhancement, and 2-4 Night for Calibration. Unlocking those is done by completing the story and subsequent emergency chapters,

There seems to be a bit of a lack of understanding from newer commanders about what night battles are. Some may even think it’s this scary thing that’s fairly hard. Truth is, they’re very simple.

There are a few small changes between day and night battles. You have no command center, so you don’t need to worry about that being taken and you also have a limit on how many echelons you can deploy at a time.

And this is formations 101, or "How not to get your t-dolls slaughtered for showing up in a terrible formation." This will cover the absolute basics, with more detailed lessons such as compositions to come later. Most of this information is based largely on Korean server meta and information.