United in Freedom
The machines of the 2nd Cuirassiers are painted in shades of purple in remembrance of their short-lived union with the Duchy of Andurien.
Per FM:Periphery, page 32.
Other references:
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The insignia of the Magistracy Royal Guards is an Amazon warrior trampling a snake. In remembrance of their short-lived union with the Duchy of Andurien, the logo of the second is the three stars of the Magistracy on the chest of a stylized Marik eagle. Per FM:Periphery, pages 26 and 32.