我们部队每个人的军人登记表上都有“何时入伍”这一栏,意即何时参军。为什么把参军称为入伍呢?追根溯源,这同我国古代军队编制有关。 原始社会没有阶级,没有国家,没有军队。出现于公元前21世纪的夏王朝是我国第一个奴隶制国家,从此才有了军队。此后的商王朝承袭夏制,组建右、中、左三师的王室军队,从而我国军事史上首次出现 Every soldier in our army has a column on when to join the army, which means when to join the army. Why does it refer to joining the army as a troop? Tracing back to its origins is related to the preparation of the ancient army in our country. Primitive society has no class, no country, no army. The Xia Dynasty, which appeared in the 21st century BC, was the first slavery state in our country and only ever had an army. Since then, the Shang dynasty inherited the summer system and formed the royal army of the right, middle and left divisions, which led to the first appearance in our military history