
This famous flag, from the American Revolutionary war, is known as the “Gadsden Flag” or sometimes it is just called the “Don't tread on me” flag.
In fall 1775, the United States Navy was established to intercept incoming British ships carrying war supplies to the British troops in the colonies. To aid in this, the Second Continental Congress authorized the mustering of five companies of Marines to accompany the Navy on their first mission. The first Marines that enlisted were from Philadelphia and they carried drums painted yellow, depicting a coiled rattlesnake with thirteen rattles, and the motto "Don't Tread On Me." This is the first recorded mention of the future Gadsden flag's symbolism.
At the Congress, Continental Colonel Christopher Gadsden was representing his home state of South Carolina. He was one of three members of the Marine Committee who were outfitting the first naval mission. It is unclear whether Gadsden took his inspiration from the Marine's drums, or if he inspired them himself.
Before the departure of that first mission, the newly appointed commander-in-chief of the Navy, Commodore Esek Hopkins, received the yellow rattlesnake flag described above from Gadsden to serve as his distinctive personal standard.
Gadsden also presented a copy of this flag to his state legislature in Charleston and was recorded in the South Carolina congressional journals:
Col. Gadsden presented to the Congress an elegant standard, such as is to be used by the commander in chief of the American navy; being a yellow field, with a lively representation of a rattle-snake in the middle, in the attitude of going to strike, and these words underneath, "Don't Tread on Me!"

First Navy Jack Flag
The U.S. Navy is relying on a historic icon to remind the world of America's strength and courage. The rattlesnake has been a favorite symbol of independence throughout America's history. Adopted as a uniquely American icon by early patriots, such as Benjamin Franklin, the rattlesnake represents American unity. Individually, its rattles have no sound, but united they can be heard by all. And while it does not strike unless threatened, once provoked, the deadly rattlesnake never surrenders.