What robust wartime helicopters would change

How would 50 to 100 reliable Allied helicopters in service by 1943 affect the war?

They would transform island operations through precise vertical lift and give Allied anti-submarine forces a highly flexible new weapon.

In the Pacific, helicopters could insert troops in squad-sized groups more accurately than parachute drops and bypass some landing obstacles. At sea, their ability to hover, search, and attack would create a powerful anti-submarine capability in both major theatres.