Which military branch has a birthday on 4 August?

The military branch that has a birthday on August 4 is the Coast Guard. The United States Coast Guard was established on this date in 1790 when the Revenue Cutter Service was created. This service was tasked with enforcing tariff laws and preventing smuggling, and it eventually evolved into the Coast Guard as it is known today. Each branch of the military has its own distinct history and commemorative dates, but August 4 specifically marks the inception of the Coast Guard, making it a significant date for that branch.