The Third Lancers use a parade scheme of Davion green with yellow highlights.
Per FM:Federated Suns, page 69.
Atlas, Battlemaster, Total Warfare (p.39)
The organization's insignia is a stylized general's baton set against a yellow flag. The initials "A.L." are displayed below the Lancers insignia. Per FM:Federated Suns, pages 66 and 69.