Last Resort I

*** It is important to be flexible in mission due to Girls Frontline does not have fixed enemy movements. So adopt accordingly.****

Clear Condition: Kill all enemy units.
Required Squads: 1 Combat + 1 Dummy

This map has hidden achievement where if all echelon have no ammo at the end of the mission, you get it. Start with combat echelon at full supply moving to one of central helipad.

It is important that you deploy a dummy echelon with NO AMMO. If you don't have one already, just deploy dummy in any map then terminate mission right away.

Swap combat echelon and Resupply when there's 5 enemy units left on the map.

Move to clear the right side of the map.

Move dummy echelon towards combat echelon.

Swap with dummy echelon and kill remaining units. you should have 0 ammo at the end of the mission and get the achievement.