What is the importance of Tarawa, Guadalcanal, Cape Gloucester in the nonfiction book, With the Old Breed, at Peleliu and Okinawa?

Tarawa, Guadalcanal, Cape Gloucester were the sites of previous marine amphibious assaults. Although victorious, the marines suffered enormous casualties and experienced utmost savagery. Many of the marines in K/3/5 are veterans of Guadalcanal or Cape Gloucester, or both. The behavior of the Japanese defenses in all three battles consisted of an all-out beach defense followed by repetitive banzai charges. This defense was not particularly effective and was anticipated—wrongly—by the marines at Peleliu.