10th July 1940
Homeland units in Japan were assigned Tsushogo consisting of compass directions like
西部West,中部 Center and東部 East and North 北部followed by number. Thus the 1st Regiment of the Imperial Guards was now simply, East 2nd Unit.
14th November 1940
Units stationed in Manchuria were all given 満州 or 満(Manchuria) as prefix followed by numbers. This was in anticipation of hostilities with Soviet Russia