Second in command of Nova Squad.
Trinity is second in command of Nova Squad and Sister to Roughblade, and is effectively the only reason he is still sane.
Trinity was one of the first Spartan-VI's and had little to no side effects of any harm, except for minor headaches.
Trinity as Roughblade's Sister was assigned to him as a friend and as family to assure he does not die mentally, most of ONI thinks that having family members on the same squad weakens the squad, but in fact the reverse happens in Nova Squad, having Trinity AND Roughblade has kept Nova Squad at the top as best Fireteam for 2 years, It has also kept Roughblade sane.