Category 6 is a mercenary organisation consisting primarily of dishonorably discharged Systems Alliance soldiers. CAT6 personnel are notorious for their histories of criminal activity and their illegal steroid abuse addictions.
Like most of their warships, the CAT6 Gladius Cruiser was an under the table deal with Cerberus Skunkworks. Not being restricted by Citadel legality, CAT6 have outfitted their cruisers main gun with several heat sinks, allowing them to "Overclock" the main accelerator.
Being operated by a mostly skeleton crew, the Gladius has automated the vast majority of its defensive and offensive combat systems. The ship itself has been heavily modified to perform a different set of tasks than its original OEM counterpart.