The Periphery [1692], page 75, set around 3059 IIRC, briefly mention the Loners as beign part of the Bullard's Armored Cavalry in the past. As far i know, its the first mention of this particular unit.
Field Manual: Periphery, page 118 tells their history when they separate from the Armored Cavalry, and only mention their logo, "...a skull, wearing a drill instructor´s hat, with a cigar in his mouth."
No mention of color scheme, so i assume they use either apropiate cammo, or their old unit colors, or primer gray.