The United States military has a hierarchical ranking system that utilizes stars, eagles, and silver bars to denote rank. The highest rank attainable is a five-star general, a rank that has been awarded to only nine individuals in American history. These individuals were awarded this rank in recognition of their exceptional leadership and service to the country.

The practice of using stars to denote rank in the military dates back to the 19th century, when the US Army began using a system of stars, eagles, and silver bars to indicate rank. The first general to be promoted to a five-star rank was General George Marshall in 1944, during World War II.
The first general to be promoted to a five-star rank was General George Marshall during World War II. He was followed by seven others, including Admiral William Leahy, General Dwight D. Eisenhower, and General Omar Bradley. These generals were recognized for their outstanding leadership during wartime.
Each of these generals was promoted to the rank of five-star in recognition of their exceptional leadership and service to the United States. General MacArthur, for example, was promoted to the rank of five-star general in 1944 in recognition of his leadership of American forces in the Pacific theater during World War II. Similarly, General Eisenhower was promoted to a five-star rank in 1944 in recognition of his leadership of Allied forces in Europe during World War II.
Despite popular culture references to a “six-star general,” this rank does not exist in the US military. Any such reference is purely fictional and has no basis in reality.
In summary, while the US military has a five-star general rank, there is no rank beyond that. Only nine individuals have been promoted to the rank of five-star general, all for their remarkable service to the country.