The Eagles of Atreus
The First Legionnaires employ the standard Legionnaire colors: white with purple and green highlights. A single gold band around the wrists and across the left torso of each BattleMech signifies the First Regiment.
Per FM:Free Worlds League, page 36.
The unit's insignia is a golden eagle flying over a stylized map of the Free Worlds League. Per FM: Free Worlds League, page 36.