Which of the following is NOT a synonym for "flag" used in JROTC?

The term "banner" is not a synonym commonly used in JROTC to refer to a flag. In the context of JROTC, the other terms—ensign, colors, and standard—are often used interchangeably to denote different types of flags that represent military units or signify specific meanings during ceremonies and events.

The term "ensign" generally refers to a flag that indicates the nationality of a ship, while "colors" specifically refers to the flags that represent a military unit or organization. The "standard" is often understood as a flag that carries the insignia of a military regiment or indicates authority. Each of these terms has distinct uses within military parlance and symbolism in JROTC, aligning closely with the roles that flags play in military tradition.

In contrast, "banner" can refer to various flags or signs used for decorative or promotional purposes rather than the specific military functions of the other terms mentioned, thus making it less appropriate within the JROTC context. Therefore, it is correctly identified as the choice that does not fit within the synonyms used for "flag" in JROTC.