They called them screaming eagles didnt they?
Yelling like this in combat could work both ways. Against green or younger troops, the tactic could be very effective as a trigger to make people take off like rabbits. Against trained troops like marines, the japanese were gunned down because they gave themselves away. Marines would just turn in the direction of the yelling and target the area.
In Burgetts book 7 roads to hell, it seemed the airborne guys considered closing with the enemy the only way to fight. And from the sounds of it, it was pretty intense.
Lewis