Lieutenant Commander is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding rank in most armies and air forces is major, and in the Royal Air Force and other Commonwealth air forces is squadron leader. It is roughly equivalent to the Corvette Captain rank in central European countries and the Captain 3rd rank rank in eastern European/CIS countries.
Second lieutenant is a junior commissioned officer military rank in many armed forces. The lowest officer rank, it is usually placed below lieutenant or first lieutenant.
Commissioned officers' rank comparison chart of all land forces of NATO member states.
The Republic of Vietnam Navy (RVNN; Vietnamese: Hải quân Việt Nam Cộng hòa - HQVNCH; was the naval branch of the South Vietnamese military, the official armed forces of the former Republic of Vietnam from 1955 to 1975. The early fleet consisted of boats from France; after 1955, and the transfer of the armed forces to Vietnamese control, the fleet was supplied from the United States. With American assistance, in 1972 the VNN became the largest Southeast Asian navy and, by some estimates, the fourth largest navy in the world, just behind the Soviet Union, the United States and the People's Republic of China, with 42,000 personnel, 672 amphibious ships and craft, 20 mine warfare vessels, 450 patrol craft, 56 service craft, and 242 junks. Other sources state that VNN was the ninth largest navy in the world. The Republic of Vietnam Navy was responsible for the protection of the country's national waters, islands, and interests of its maritime economy, as well as for the co-ordination of maritime police, customs service and the maritime border defence force.
The comparative military ranks of Korea are the military insignia used by the two nations on the Korean Peninsula, those being the Republic of Korea Armed Forces and the Korean People's Army of the Democratic People's Republic of Korea. The United States Forces Korea personnel wear the ranks and insignia used by other service personnel of the United States Armed Forces in the territories of the United States.
Bing is the rank usually held by enlisted personnel in some East Asian militaries. The ranks are used in both the People's Republic of China and the Republic of China on Taiwan, and both North and South Korea. The rank name is based on one of the four ancient occupations.
The Military ranks of South Korea are the military insignia used by the Republic of Korea Armed Forces. Due to the close military cooperation and the presence of the United States Forces Korea, South Korean ranks are inspired by the United States.
United States Army commissioned officers rank insignia in use today.
The Military ranks of the Republic of China are the ranks used by the Republic of China Armed Forces. The official military rank names in Traditional Chinese are identical across all different military branches, but their English translations may be different.
General of the Air Force (GAF) is a five-star general officer rank and is the highest possible rank in the United States Air Force. General of the Air Force ranks immediately above a general and is equivalent to General of the Army in the United States Army and Fleet Admiral in the United States Navy. The rank has only been held by one man, General Henry H. Arnold, who had served as head of the United States Army Air Forces during World War II. As at the time of his promotion, the Air Force was a component of the Army instead of its own branch, the rank has not been first awarded to someone who is serving in the Air Force. Arnold retained the rank when the separate branch was created, and he was redesignated General of the Air Force in 1949.
Wei is a company-grade officer rank used in some East Asian militaries, including China, Taiwan, North Korea and South Korea.
Jiang is a general officer rank used by China and Taiwan. It is also used as jang in North and South Korea, shō in Japan, and tướng in Vietnam.
Rank comparison chart of air forces of North and South American states.
The Military ranks of Mongolia are the military insignia used by the Mongolian Armed Forces and other military organisations such as Border defense troops, Internal troops, National emergency management agency, General executive agency of Court decision, General intelligence agency, and the State special security department.
The military ranks of Afghanistan were the military insignia used by militaries of Afghanistan throughout history.
The Military ranks of Haiti are the military insignia used by the Armed Forces of Haiti. Being a former colony of France, Haiti shares a rank structure similar to that of France.
The military ranks of Imperial Iran are the military insignia used by the Military of Imperial Iran.
The Military ranks of Myanmar are the military insignia used by the Myanmar Armed Forces, its auxiliary services, some government departments and some civilian organizations.
Shi is the rank usually held by Non-commissioned officers in some East Asian militaries. The ranks are used in both the People's Republic of China and Taiwan, and both North and South Korea. The rank name is based on the on one of the four ancient occupations.
Sa is the rank held by field-grade officers in the militaries of Japan, Vietnam and North Korea.
Army of the Republic of Vietnam 
Republic of Vietnam Navy 
Republic of Vietnam Marine Division 
Republic of Vietnam Air Force 
