Cracking the enemy's radio code is a task so urgent and so difficult that it demands the military's best minds and most sophisticated technology. But when the coded messages are in a language as complex as Japanese, decoding problems multiply dramatically.

It took the U.S. Army a full two years after the attack on Pearl Harbor to break the codes of the Japanese Imperial Army. But by 1944 the U.S. was decoding more than 20,000 messages a month filled with information about enemy movements, strategy, fortifications, troop strengths, and supply convoys.

In MacArthur's ULTRA,...

Japan's war in Asia and the Pacific from 1937 to 1945 continues to be a subject of great interest, yet the wartime Japanese army remains little understood outside Japan. Most published accounts rely on English-language works written in the 1950s and 1960s. The Japanese-language sources have remained relatively inaccessible to Western scholars in part because of the difficulty of the language, a difficulty that Edward J. Drea, who reads Japanese, surmounts. In a series of searching examinations of the structure, ethos, and goals of the Japanese military establishment, Drea offers new material...

Originally published in 1984, this a volume in the Combat Studies Institute "Leavenworth Papers" series. On the night of 10-11 July, several thousand Japanese infantrymen attack and broke through U.S. Army covering force units defending the Driniumor River about twenty miles east of Aitape, New Guinea. For the next month U.S. army troops were locked in a battle of attrition with the Japanese, as the Americans fought to restore the breakthrough line and destroy the Japanese attackers. This study describes the events leading up to the Japanese breakthrough and the subsequent American...

Originally published in 2006, this volume from the History Office of the Office of the Secretary of Defense provides a narrative history and assessment of the early years of Robert McNamara's tenure as Secretary of Defense, including McNamara's relationship with Presidents Kennedy and Johnson, the transformation of the Department of Defense as a part of Kennedy's New Frontier, and the Pentagon's handling of the Cuban Missile Crisis, Bay of Pigs episode, and onset of the Vietnam War along with other major national security events and developments during a turbulent and momentous period of the...

Society for Military History Distinguished Book Award

Popular impressions of the imperial Japanese army still promote images of suicidal banzai charges and fanatical leaders blindly devoted to their emperor. Edward Drea looks well past those stereotypes to unfold the more complex story of how that army came to power and extended its influence at home and abroad to become one of the world's dominant fighting forces.

This first comprehensive English-language history of the Japanese army traces its origins, evolution, and impact as an engine of the country's regional and...