As a result of the underwater obstacles and beach mines uncovered at Tarawa, for the first time Navy underwater demolition teams had been formed for future operations. Fortunately, they found no mines at Roi-Namur and were not needed at Kwajalein.
Another factor which would assist the assault troops was the configuration of the atoll. The two main objectives, at the north end and at the south, were each adjoined by islets, and these neighboring locations were to be seized on D-day, 31 January, as bases to provide close-in artillery support for the infantry landing. On either side of Roi-Namur the 14th Marines would bring in its 75mm and 105mm howitzers and dig them in to support the main landing from islets which carried the exotic names of Ennuebing, Mellu, Ennubirr, Ennumennet, and Ennugarret. As is always the case in war, there were problems. The task was assigned to the 25th Marines, and, because of communications difficulties, the different units going ashore on different islets could not coordinate their landings. Their radios went dead from drenching sea swells that swept over the gunwales of the amtracs (LVTs, landing vehicles, tracked, or amphibian tractors). Nevertheless, by nightfall, the beachheads had been secured, and, for the first time, U.S. Marines had landed on a Japanese mandate.
On board the transports outside the lagoon, the men of the 23d and 24th Marines spent the afternoon of D-day transferring to LSTs (Landing Ships, Tank). That night saw a muddled picture of amphibian tractors stranded or out of gas inside the lagoon, with many others wandering in the blackout as they sought to find their own LST mother ship.
While this scramble was going on, the assault troops on board the LSTs were facing, each in his own way, the prospect of intensive combat on the following morning. One rifleman, Private First Class Robert F. Graf, remembered:
As I thought of the landing that I would be making on the morrow, I was both excited and anxious. Yes, I thought of death, but I wasn’t afraid. Somehow I couldn’t see myself as dead. “Why wasn’t there fear?” I wondered. Even though I was nervous, it was with excitement, not fear. Instead there was a thrill. I was headed for great adventure, where I had wanted to be. This was just an adventure. It was “grown up” Cowboys and Indians, it was “grown up” Cops and Robbers.... Thoughts of glory were in my mind that night. Now it was my turn to “carry the flag” into battle. It was my turn to be a part of history. To top it all off, I was going into battle with the “Elite of the Elite,” the United States Marines. Just prior to falling asleep, I prayed. My prayers were for courage, for my family, and I prayed to stay alive.
By the next morning, D plus 1, 1 February, the LSTs had moved inside the lagoon. Up before dawn, the infantrymen filed into the cavernous holds of the LSTs and clambered onboard their amphibious tractors. Graf described his equipment:
Landings were made with each person loaded with weight. We wore our dungarees, leggings, and boondockers (shoes). Our skivvies (underwear) had been dyed green while we were still in the States. White ones were too good a target. In addition, our packs were loaded with whatever gear we thought we would need, such as extra socks, toilet gear, poncho, and our “D” and “K” rations. Extra cigarettes were stuffed in also. Believe it or not, some of us carried books that we were reading.
I wore two knives. The K Bar [knife] that was issued was tucked into my right legging. The throwing stiletto that I had purchased was on my belt; a leather thong at the bottom of the sheath was tied around my leg so that the knife would not flop around. My bayonet was in its sheath and attached to my pack. On went the loaded pack. Around my waist went the cartridge belt, fully loaded, with ten clips of M1 rifle ammo, each clip holding eight rounds. Over my shoulder were two bandoleers of M1 ammo, holding an additional eighty rounds. Hanging from my pockets were four hand grenades, only requiring a pulled pin to be activated. We donned our helmets with the brown camouflaged covering. Finally we slung our gas masks over our shoulders. Now we were ready for bear!
Department of Defense Photo (USMC) 146975