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Originally assigned to the Lyrans' generalized "irregular" forces during the Jihad, after that conflict's conclusion the LAAF high command chose to standardize the unit as an LCT, renaming it as the new Eleventh Donegal Guards.
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Honoring the mercenary unit's service to the Lyran realm and the losses it suffered during Operation BROKEN FIST, the mercenaries accepted the invitation to become an LAAF line unit under the name of the Blackjacks. In late 3068 the Jacks were sent to Senftenberg to recover from their combat on Giausar. Surrounded and outgunned, the Jacks had to withdraw, with only two of their DropShips making it through the League space cordon. Pico's Pathfinder (scouts for the Marik forces) were shattered by The One Eyed Jacks. The invaders wiped out the two companies of the Wilde Turkeys mercenary command and the battalion-sized conventional militia. In 3068, an assault force consisting of the 20th Marik Militia and either the First or Second Knights of the Inner Sphere, backed by a mercenary force ( Cumberland's Missiliers among them) attacked Giausar. The unit was hired by Caesar Steiner and has since been stationed on Giausar against a Marik incursion. After the assault, they refilled their shattered ranks. They raided the Clan Jade Falcon–held world of Sudeten.
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The unit was formed in 3062 by former students of the Blackjack School of Conflict.
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