(military, historical) the Imperial Japanese Army

Empire of Japan (official name of Japan under the Constitution of the Empire of Japan, 1890-1947)

(military, historical) the Imperial Japanese Navy

age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

(military, historical) 大日本帝国陸軍 / (military) 陸上自衛隊

period drama

a historical period where social disorder is so great due to war, disease, political disorder etc. that there is little or no cultural development; Dark Ages

(Greek mythology) the Heroic Age

(Greek mythology) the Golden Age

a golden age (time of progress and achievement)