The 51st Transport Regiment had constructed an airstrip on Lorengau and commenced another, known as Momote Airstrip, at the Momote Plantation on Los Negros. Lorengau was used as a staging point for aircraft moving between Rabaul and airstrips in North East New Guinea. The importance of the Admiralty Islands to the Japanese increased as the result of Allied advances in New Guinea and New Britain which blocked off other air routes. By February, both airstrips were unserviceable and the antiaircraft guns were silent to conserve ammunition and conceal their positions. Ezaki had ordered his men to neither move nor fire in daylight.