Alpha-27, also known as "Clark" or "A-27," was an ARC-Trooper who fought during the outbreak of the Clone Wars. He was apart of regimen program of first 100 ARC-Troopers designated Alpha-Class, who were trained by Jango Fett. He was also a comrade to Gohan, Conan, Goten, Alpha-12, Alpha-17, Alpha-47, Alpha-77, Alpha-78, Alpha-98, and several dozen ARC's and Commandos.
After being integrated into the Republic Army, Clark, like many of the ARC's, were drafted into the outbreak of the Clone Wars, where he fought in numerous intensive battles through the Galaxy, usually working in self-contained solo missions/operations or supplementing and leading small squads, in more larger GAR operations.
On several occasions, Clark would usually respond to the aid for Gohan and several other members of his Fett-Brothers, ARC's and Commandos in need. It was Clark who assisted Gohan in providing backup and assistance on Gohan's mission after the Second Battle Of Jabiim to secure the safety and relocation of the surviving Jabiimi Loyalists. Like Gohan, the Jabiimi Loyalists would forever remember and honor Gohan and him for their efforts in protecting them and helping them start over on their new home elsewhere.
Towards the end of the Old Republic and the rise of the New Order, Clark, become one of the few ARC's who joined Gohan's uprising in the fight against the Imperial Empire.
Clark would be promoted to Clone Marshal Commander and served as the Fourth-In-Command of Gohan's rebellion.