Final answer:
The Navy's Birthday is on October 13th, and the Department of the Navy was formed in 1798.
Step-by-step explanation:
The Navy's Birthday is celebrated on October 13th every year. It was on this date in 1775 that the Continental Congress authorized the establishment of a naval force, which eventually became the United States Navy.
The Department of the Navy was formed in the year 1798. It was established by an act of Congress on April 30th, 1798, during the presidency of John Adams.
It's important to note that the Department of the Navy is one of the branches of the Department of Defense, which was officially created in 1949.