The Moultrie Flag was raised during the Battle of Sullivan's Isl

https://elliotlsyr757.theburnward.com/final-honors-the-flag-s-significance-at-military-funerals

The Moultrie Flag was raised during the Battle of Sullivan's Island in 1776; showcasing a blue field with a palmetto tree and crescent moon, it symbolizes resilience against British attacks in defense of Charleston.