Coast Guard Day is August 4th.
The Coast Guard is America’s maritime first responder. The United States Coast Guard (USCG) is the coastal defense, search and rescue, and maritime law enforcementbranch of the United States Armed Forces and one of the country’s seven uniformed services. 
Created by the U.S. Congress on 4 August 1790 at the request of Alexander Hamilton as the Revenue-Marine, it is the oldest continuous seagoing service of the United States. As Secretary of the Treasury, Hamilton headed the Revenue-Marine, whose original purpose was collecting customs duties at U.S. seaports. By the 1860s, the service was known as the U.S. Revenue Cutter Service and the term Revenue-Marine gradually fell into disuse.

The flag of the United States Coast Guard is white with a dark blue Great Seal of the United States; the shield on the eagle’s breast has a blue chief over vertical red and white stripes. Inscribed in an arc above the eagle is “UNITED STATES COAST GUARD”; below the eagle is the Coast Guard motto, “SEMPER PARATUS” (“Always Ready”) and beneath that in Arabic numerals is “1790” (the year in which the service’s ancestor, the U.S. Revenue Cutter Service, was founded). All inscriptions on the flag are in dark blue typeface.

Read more about the first 10 cutters https://www.uspatriotflags.com/the-first-10-cutters-of-the-us-coast-guard/