What were the major allied concerns in the counterattack against the Japanses in the Pacific War?

Answer 1

There were really three:

1. Eliminating Japanese airpower, both naval and island-based, substituting it with their own, thus coming closer to the ability to harm and eventually invade the Home Islands.

2. Once the Japanese threat to Australia had been turned back, leaping island by island closer to the Philippines, on the way starving out unsuppliable Japanese garrisons.

3. Regaining Burmese territory lost in 1942, with the final object of maintaining communications and keeping the Chinese in the war.

Answer 2

Finding and destroying Japanese aircraft carriers, and conquering airfields as close to Japan as possible.

"On June 30, the Allies launched Operation Cartwheel, a grand strategy for the South and South West Pacific, aimed at isolating the major Japanese base at Rabaul, before proceeding on an "island-hopping" campaign towards Japan. Three main objectives were identified: recapturing Tulagi and the Santa Cruz Islands; recapturing the north coast of New Guinea, and the central Solomon Islands and; the reduction of Rabaul and related bases."

"The U.S. strategic objective was to gain airbases within bombing range of the new B-29s on the Mariana Islands, especially Saipan, Tinian and Guam."

"World War II : Battle of the Pacific" : http://en.wikipedia.org/wiki/WW2#Battle_of_the_Pacific

"Operation Cartwheel" : http://en.wikipedia.org/wiki/Operation_Cartwheel

Answer 3

the allies were concerned about taking the pacific islands. They came up with a theory called "Island hopping" taking each japanese island one by one by full scale amphibious invasions by the Marines