Shark and the Sea IV
Objective: Capture this Radar Tower:
Recommended Echelon(s): AR/SMG (x2), Dummy
The concept for this map is simple: you need to defend your Command Center while moving to the Radar Tower below. No tricks, no gimmicks, that's it. The only thing you need to do is move past M16 before she blocks your path through, so this should be your primary focus early on. Because this guide focuses on using only two echelons for normal, we'll be doing some stuff that's entirely optional if you have more than two combat echelons. If you have three, you can just sit on your Heliport/Command Center and ignore a lot of the map, but I digress.
For now, deploy your two combat echelons to start off with. Move the combat echelon on your Command Center to the last 3rd party Heliport before the one-way path that goes past M16. This one:
Once you've done that, deploy a dummy echelon on your Command Center and swap it with your other combat echelon. Now you'll have some extra AP as well as something that can defend your Command Center on the enemy turn.
On turn two, we want to ensure our Command Center and dummy echelon are safe. To do this, we'll take out the Striker coming in on the bridge with the combat echelon defending our Command Center. Move your dummy echelon over to the Command Center, then swap with your combat echelon. That should be enough to defend it until the end of the map. Now, we can proceed with capturing the Radar Tower without much interference. Use the remaining AP to go toward the Radar Tower with your other combat echelon.
On turn three, all you need to do is to keep moving toward the Radar Tower, and on turn four you can finish moving to the tower and capture it to finish the map.
Video of me clearing this map