Well, we can forget about American Pacific offensives in '42 and for most of '43 as well. Presume all 3 carriers are sunk. Saratoga, Wasp and Ranger are the only carriers left in the US Fleet, and the later two are in the Atlantic. Maybe they both get sent to the Pacific a bit earlier. I suppose the focus of the later part of 1942 becomes the defence of Hawaii and proetcting the SLOCs to the West Coast. How would the eventual USN offensive occur, in this TL? Would RN try and take the offensive in the Far East to relieve the pressue on the Americans.