Who adopted the dress blue uniform for the Marine Corps?

The correct answer is Sec. of War James McHenry, who was instrumental in the adoption of the Marine Corps dress blue uniform. In the late 18th century, McHenry recognized the need for the Marines to have a distinct and formal uniform that would exemplify their professionalism and distinguish them from other branches of the military. This decision reflected an understanding of both military tradition and the importance of fostering a strong identity for the Marine Corps.

While General Archibald Henderson is a notable figure in Marine Corps history and served as the 5th Commandant, he did not play a role in the adoption of the dress blue uniform. Similarly, General Pate and Lieutenant Colonel John H. Glenn, while significant in their own rights, were not involved in the initial adoption of this particular uniform style. The dress blues have become an iconic representation of the Marine Corps, largely due to the policies enacted during McHenry's time.