Here is a collection of early color photos taken in postwar by GHQ staffers,
excerpt:
The National Diet Library in Tokyo caught attention this autumn when it published color photos taken immediately after the end of World War II by a staffer at the General Headquarters (GHQ).
For even older visual history, browse these photos copied from Library of Congress in Washington, DC at the Prints and Photograph room, http://old-japanphotos.wikispaces.com/ (and the companion project for comparison, http://old-koreaphotos.wikispaces.com/ )