The soldier who carries the standard of the unit in military parades or in battle WordNet 3.0 & Open English WordNet

A standard-bearer, also known as a colour-bearer or flag-bearer, is a person who bears an emblem known as a standard or military colours, i.e. either a type of flag or an inflexible but mobile image, which is used as a formal, visual symbol of a state, prince, military unit, etc. Wikipedia

A person who bears an emblem called an ensign or standard Wikipedia Disambiguation

Person who carries a flag, banner or standard in an official capacity Wikidata

A person who carries a flag or banner (a standard). Wiktionary

Person who carries flag or banner. Wiktionary (translation)