日本軍 (Nihon-gun) refers to the military forces of Japan, particularly during the period of the Empire of Japan from the late 19th century until the end of World War II in 1945. It consisted of the Imperial Japanese Army and the Imperial Japanese Navy, which played significant roles in various conflicts, including the Second Sino-Japanese War and World War II. The 日本軍 was known for its aggressive expansionist policies, leading to the occupation of several territories in Asia and the Pacific. The military's actions during this time, including the infamous Nanjing Massacre, have had lasting impacts on Japan's relations with its neighbors and are subjects of historical debate and remembrance.