The Second's colors are green and black.
Per FM:Periphery, page 41.
To maintain their ties to the Canopian Highlanders regiment, the insignia of the Magistracy Highlanders is a tam-o'shanter cap atop Canopus IV “ changed from the stylized world of the original unit. As a tribute to a unit that the Second felt had served the Magistracy admirably, the Second changed their logo to that of an eagle with ash coated wings, protecting the world of Canopus in its wings. Per FM:Periphery, pages 26 and 41.