The photograph shows one of the Morotai beaches where U.S. forces landed.
As the landings unfolded, SIGINT developed by Central Bureau Brisbane (CBB) gave U.S. commanders detailed insight into Japanese strength and plans. CBB was the cryptologic organization established to support Allied operations in the Southwest Pacific Theater and had cryptologic personnel from all the Allied nations involved in the Theater.
Although the Japanese military had not detected the destination or timing of the initial landings, the decrypt of a Japanese message in early November indicated that Japanese headquarters in the Philippines now recognized the threat presented by Allied operations on Morotai and was deploying troops to meet it. Decrypts over the next few days revealed the landing of a Japanese infantry regiment and gave total Japanese strength on the island as 1,900 men.
Although decrypts with specifics about Japanese air raids on American air fields on Morotai in November and December came after the attacks, the U.S. defenders had been forewarned of the attacks by tactical intercept and traffic analysis.
Decrypts of messages relating to Japanese attempts to outrun the American air and naval blockade around Morotai revealed the location of a Japanese military “hideout.” U.S. bombers subsequently attacked and eliminated the Japanese base.
An Army history of the Morotai operation notes that the airfields established there proved extremely valuable in subsequent operations.
SIGINT produced by CBB proved of inestimable value in saving American lives and successful conclusion of the military operations.