Which insignia represents a ranking official who is a flag officer (O7-O10)?

The insignia that represents a flag officer, specifically those holding ranks from O7 to O10, is the halberd insignia. Flag officers are high-ranking members of the military, and their insignia often signifies their status and authority. The halberd insignia typically consists of a stylized depiction of a halberd, which is a pole weapon that has been associated historically with military leadership and command.

Understanding the distinction between various insignias is crucial, as each type symbolizes different ranks and roles within the military hierarchy. The ball insignia and star insignia denote different classifications within the overall ranking structure. The flat truck insignia is not commonly associated with flag officers but instead represents different capacities or functions that do not correlate with the higher ranks of O7 to O10. Hence, the halberd insignia distinctly identifies flag officers, reflecting their significant leadership role within the military command structure.