In different usages the term “flag officer” usually applies to naval ranks such as admiral, vice-admiral, or rear-admiral. In some armies, however, the rank of captain general, general of the army, army general or colonel general occupied or occupies this place. Depending on circumstances and the military in question, these ranks could also be thought of to be equivalent to a “full” general or to a subject marshal five-star rank (NATO OF-10). As a lieutenant outranks a sergeant main; confusion often arises as a result of a lieutenant is outranked by a significant. Originally the serjeant main was, exclusively, the commander of the infantry, junior only to the captain-general and lieutenant general.
It is used in Germany, where it comes from initially, and from the place it will definitely unfold to the United Kingdom and thence subsequently to other Commonwealth countries and the United States. The general officer ranks are …