The Tenacious Esteem was a DDS-class carrier that was in service in the final years of the Covenant Empire. Built during the height of the war with the Jiralhanae, the Esteem was assigned to the Fleet of Righteous Crusaders to crush their military. It would be instrumental in the conflict and beyond, earning several battle-honours to distinguish itself from its peers. Becoming responsible for suppressing a number of key rebellions, it would be in a position to lead a self-sufficient fleet to further the Covenant's borders when the Prophets declared war against humanity. It would be responsible for many successful attacks on human colonies.
In 2538, after being disabled in combat by a UNSC hunting battlegroup, the Esteem would be requisitioned by the Ministry of Tranquility. Retrofitted as a heavy exploration vessel and placed under the command of disgraced Shipmaster Erus 'Redamee, the Esteem would help map the Covenant's borders until 2549. Then, it was attacked and successfully hijacked by a Kig-Yar pirate group. However, as they lacked the manpower to use it, they left it sitting in a dock near their hideout, hoping to sell it for a fortune. Fortunately, the base was infiltrated and then cleansed by the Covenant splinter-faction known as the Knights of Loyalty, the boarding party led by former Field Marshal of the Covenant Empire Jez 'Varum.
Recovering the largely-intact ship, Jez 'Varum would become the ship's latest commander, leading its crew through the chaos of the Great Schism and allying himself with the rising Swords of Sanghelios. It saw use in combat after a long time during the Battle of Earth and Battle of Installation 00. After the Great War's end, Jez would commandeer the Esteem as his personal ship, going on scouting missions and leading the ship in skirmishes against the Covenant Remnant. It assisted the UNSC once more during the 'Hunt for the Revenant', the humans' name for the long-chase for the rogue Spartan known by the name "Revenant", who allied with a Remnant faction which Jez had been tracking down. The Esteem's next major mission was during the Created crisis. The Tenacious Esteem and its crew remained loyal to the valiant commander that was Jez 'Varum till his final battle.