While the A-10 may have more armor than helicopters, it also is more difficult to hit with dumb munitions, because of the way it manuevers for attack. Helicopter pilots are probably going to have to adjust their tactics so that they are moving while attacking and not hovering as much. They also will need to attack from different altitudes making it harder for ground fire to get a bead on them. If the choppers can't find away to avoid the dumb ammo their usefulness in attack is going to be greatly restricted. If the Air Force is phasing out the A-10, the Marines should try to pick them up as a close air support weapon.