D. Ramsey: "Captain Partridge was never known to be without his uniform... His was that of the Corps of Engineers with embroidered cuffs and the Essayons button..." United States Marine Corps The Marine Corps adapted the Corps Castle for the insignia of the 1st, 2nd, and 3rd Combat Engineer Battalions. When the 18th Naval Construction Battalion was re-designated 3rd Battalion 18th Marines they also adapted the Corps Castle. See also Gold Castles References United States Army Corps of Engineers United States military badges