* Use your squad extremely wisely. For every step of the way and for every room, move them to cover ahead of yourself and wait until they have completely cleared the area before moving ahead. When all appears safe, you should still send them further into the room and toward your objective marker to make absolutely sure that there are no enemies remaining.

* Use snake cam to your advantage. You have the ability to tag enemies from here as well as move your squad around the room. You may find yourself skillfully clearing an entire room without leaving snake cam.

* Use the tagging feature to your advantage. Assuming you'll be keeping away from the action, try to find good cover from which you scan your crosshair across the battlefield, tapping LB frequently until you find enemies. You can use this to either clear a room faster or protect yourself and your squad from the more dangerous enemies.

* Try using the shield and pistol method. You unlock the shield by getting to the last level of Assault in ACES. See the "Weapon Collector" achievement for tips on how to level up faster. You can also pick up a shield in a mission and it will stay in your outfitting until you change it for something else.