The lieutenant rank system has undergone many changes in history, including the establishment and adjustment of military ranks such as lieutenant and captain. Under the current military rank system, lieutenant and captain correspond to the positions of deputy company, principal company and full company respectively.
Under the new rank system, the rank of captain corresponds to the rank of captain. This is based on the system of "one rank per office", so that each position has a specific and fixed rank. This means that if an officer's rank is a full company, then his rank is captain. This system helps to clarify the duties and status of each officer.
Lieutenant is a military rank title for the rank of lieutenant in the military of some countries, and in the military rank system of countries around the world, lieutenant is established as the second rank of lieutenant. In the history of the rank system, the rank of lieutenant was established in ancient times, during the Nanjing Provisional Period, the Beiyang Period, the National Period, and the People's Republic of China.
In the Chinese People's Liberation Army, lieutenants correspond to the rank of deputy company, full company or professional skill level 13 and 12. According to the Regulations on the Ranks of Officers of the Chinese People's Liberation Army, lieutenant is the establishment rank of officers in the main company, deputy company, platoon and junior professional and technical positions. Those who have graduated from a university may be awarded this title or second lieutenant. Lieutenants shall be conferred with the approval of the principal head of a group army or other corps-level unit with the authority to appoint and dismiss officers. The promotion of a lieutenant to captain is generally four years.
Captain is a rank in the army, above lieutenant. Under the new rank system, the rank of captain corresponds to that of a company-level officer. According to the latest regulations, the minimum length of service for a captain officer is 4 years, the maximum length of service is 9 years, and the maximum age of service is 40 years. In other words, the promotion of "captain" to "major" requires a minimum of 4 years of service, and if you have served in the rank of captain for 9 years, or if you reach the age of 40, you need to retire.