Sergeant Overholt was a Barrayaran Imperial Security guard. His first task involving Miles Vorkosigan was to transport him from Kyril Island to ImpSec Headquarters for questioning. Next Overholt served undercover as Miles's bodyguard (Miles took to thinking of him as Sergeant-Nanny at that time), then as Captain Ungari's assistant (which led to him being locked up in the Triumph's brig alongside Ungari, Metzov, and Oser), and then as Emperor Gregor's personal bodyguard.