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Neptune is the fugitive Fleet's crisis-control ship, operating under military service in 7360.
A bomb planted on a transport shuttle by Paris and his blackshirt cohorts inflicts damage to Hephaestus, trapping Major Boomer aboard. Neptune dispatches a shuttle with a crisis response crew to board the burning Hepahestus, only to be be besieged by seditionist elements and trapped aboard despite Boomer's assistance. Boomer is able to assist in extracting Neptune's surviving crew during a battle, saving a bulk of their team (RH: Armageddon).