Lieutenant Commander Kurt-051, born Kurt M. Trevelyan and also known as Kurt Ambrose, (UNSCMID: 045888947) was a SPARTAN-II super-soldier. One of the early aspiring leaders of the SPARTAN-II Program, he was close to many of the other SPARTANs, before he went missing during a mission in 2531. He was presumed dead and in accordance with ONI Directive-930 reported as being MIA. Although the other SPARTANs were led to believe that Kurt had died, he was actually recruited by Colonel James Ackerson to lead the SPARTAN-III program. "Ambrose" is not his true surname; rather Colonel Ackerson gave it to him after his abduction, thanks to the extensive mental conditioning that took place in the SPARTAN-II program that caused Kurt to forget his full name.