“We were glad when we reached Tokyo, where the destruction was bad enough, too, but where at least some parts of the city had been spared in anticipation of the Allied occupation. This was evidently true of the area along the Imperial moat, where the impressive Dai Ichi Sogo building was located. Previously occupied by a giant insurance company, it now served as the seat of the General Headquarters (GHQ) under the American general with the title Supreme Commander for the Allied Powers, abbreviated SCAP. This establishment, also known as SCAP, was a microcosm in itself, born quite suddenly in the middle of an alien world. It had all the ingredients of a giant bureaucracy, with ambitious chiefs who were sometimes rivals for the favor the top man.
“While in theory representing the Allied victors, the headquarters was in actuality almost completely American. It consisted of two parts: first, the typical American general staff organization with its four G’s (the Personnel, Intelligence, Operations, and Supply and Logistics Sections), an adjutant general, a judge advocate, and so forth; and second, a number of special ‘Sections’, each of them responsible for a distinctive element of Occupation policy.”
– Legal Reform in Occupied Japan: A Participant Looks Back, by Alfred Christian Oppler, 2015