|Battles/wars||Battle of Earth|
Jenny Grecko served in the Battle of Earth with the Confederation Fourth Marines. At that time she had not seen her father, Duke Grecko, for several years, as a result of her parents' divorce.
She was in one of the boarding parties that planted thermo-nuclear mines deep inside the Kilrathi Hakaga carriers and then detonated them. Her friend Jenny McCrae, whom she had met at boot camp, was with Jenny's father when she detonated an anti-matter mine on a Hakaga carrier.