The Avenging Angels
The Marik Militias use a color scheme first seen in 2620--purple with red accents on the right side and blue on the left.
Per FM:Free Worlds League, page 54.
Stinger, Camo Specs (p 7)
Each 'Mech displays the Marik Militia crest - a stylized Marik Eagle on a red and blue background - on its left arm or weapons pod. The insignia of the First Marik Militia is a blue disc emblazoned with an angel who holds aloft a gleaming sword. Per FM: Free Worlds League, pages 53 and 54.