This was suggested before in January, but it didnt get alot of recognition, so there fore I am suggesting this again, cause this would be great for raids.
overwatch, speaks for it self.
Allowing a player to get to another, higher up position (equipped with any long range rifle, for example, on top of a hillside, rock or a building)
If the entry team enters the objective, the overwatch can secure the outside of the building incase any AI bots will flank them.