The Pacific phase of the Second World War was almost exclusively an American Naval operation. As such it was, just as U.S. Navy war planners in the 1920', and 1930's had anticipated in their Basic War Plan ORANGE, a "war, primarily naval" in its prosecution. The vast expanse of the Pacific and the great distances separating the nation from its outlying possessions clearly dictated that in a war with a Far Eastern enemy the U.S. Navy would have to bear the brunt of the fighting. It would also be responsible for the logistical support of American ground forces whose mission it would be to dislodge the enemy from the many island groups and archipelagos of the Pacific.
Doyle, Michael K.
"The United States Navy- Strategy and Far Eastern Foreign Policy, 1931-1941,"
Naval War College Review: Vol. 30
, Article 6.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol30/iss1/6