Shadow Armor (Long War)
By integrating a stealth field based on the phase-shifts observed in the hyperwave beacon, this suit makes it extremely difficult for the wearer to be detected in the field. It should be noted, the stealth system is only effective when used by a soldier in cover.
If you want to surprise the aliens and remain alive to tell the story afterwards then this is the armor for you. It is light and provides both defense and a fail-safe ability when the aliens are alerted to your presence. Unfortunately the trade off is less space for carrying additional items.