Final answer:
Flag officer endorsements are formatted according to official military correspondence guidelines and typically include the endorser's rank, name, service number, and approval language, often following a standard letter format in branches like the U.S. Navy.
Step-by-step explanation:
The format used for flag officer endorsements typically follows official military correspondence guidelines. These endorsements are formal statements of support or approvals from higher-ranking officers, usually within the context of official evaluations, recommendations for awards, or other official military documentation. The exact format can vary by branch but generally includes the endorser's rank, name, service number, and specific language that indicates their support or approval. In some cases, such as in the U.S. Navy, endorsements are written in a standard naval letter format.