BioEditHorn Company was an elite unit or battalion of Clone Troopers during the Clone Wars Era led by Jedi General Eeth Koth and Clone Captain Lock (who had the position of being a Senior Clone Officer).
The unit itself was merely a reinforcement battalion which consisted of a handful of large platoons meant for aiding other units in combat.
Very little is known about the unit, though their Jedi General is more well-known (primarily amongst fans) within the rest of the Star Wars universe and the saga as a whole.
AppearanceEditThe clones enlisted within the unit, as well as their lead commanding officer Captain Lock, have distinct light-green markings with unique crescent patterns reminiscent of their General's heritage.
Star Wars: The Clone Wars "Grievous Intrigue"
The unique horn symbols are actually meant to resemble an old native Zabraki tribe known as the Green Horn Tribe, which was Jedi General Eeth Koth's native tribe.