Harris Graff

Graff was the name of a MechWarrior, employed at least in 3028 by the Gray Death Legion mercenary unit.

Involvement in Sirius V incident

Graff, who was working in secret as an accomplice to either ComStar rogue Precentor Rachan or Marik noble Lord Garth of Irian (or both) betrayed the Legion by allowing (what could be considered) special-ops forces belonging to either Rachan or Lord Garth to place an explosive device in the domed Sirius V city, Tiantan.

Actions on Helm

Tiantan was destroyed shortly thereafter, and Graff continued his service with the Legion as it returned to its landhold on the planet Helm. His subterfuge was later discovered by Gray Death commander Grayson Carlyle, as the plot by Rachan and Lord Garth to discover and take possession of the Star League cache of Lostech on Helm failed. Instead, the Legion gained possession of a copy of the Helm Memory Core, a three-century-old computer containing many Star League-era secrets, ranging from improving crop production to the design of all sorts of technology, equipment and military hardware.