40th Marik Militia: Stewart's Black Avengers
The Marik Militias use a color scheme first seen in 2620--purple with red accents on the right side and blue on the left. In addition, the Fortieth paints the heads, upper torsos, hands and feet of their 'Mechs jet black.
Per Field Manual: 3085, p.79
Other references: none
As their logo, the Fortieth uses the skull and crossbones, below which is set the motto "Remissio Non Est." Per Field Manual: 3085, p.79