Reid

 was the trooper assigned to guard the Princess of Galen; Krisztina and knew her in his youth. He and Krisztina were deeply in love, and played by the rivers. He disappeared for 5 years though. He was the son of the palace gardener. He was part of the 27th infantry barracks, and received an award from Krisztina for bravery. He liked to skip-stones, and was, according to the Sixth Doctor a geologist's nightmare. He was killed in the Killoran attack. (AUDIO: Arrangements for War)