A must for the allies to stand a chance of winning. The Turkish strait has got to be closed! The Italians can do a commando landing in the Caucasus and kill off a few Soviet pieces then the Germans go and finish off the Caucasus before the Soviets go again. Totally a necessary rule! The scramble and escort rule works too as the U.S. and Brits can bomb Germany time after time with just the antiaircraft “1” rolls to fear!
If you play by the book on this option, incoming StBs and escorting Fg submit to AA gun fire, then to intercepting Fighter defending @2.
StB have no attack roll, only escorting Fg A1.
No real piece of cake for D6 damage on IC, if Germany put 2 Fighters as deterrent.