Endeavour Division is an administrative grouping for ships of Sirius Squadron that operate independent of one another and answer directly to squadron command. As well as the squadron’s rapid response vessel, Endeavour, it includes the Romulan Republic and Klingon Empire vessels assigned to the unit. Each serves where the squadron requires them, alone or alongside the ships of other divisions, providing specialist support in emergent situations.

• Endeavour: The squadron’s first response and specialist operations vessel. A versatile and powerful explorer, Endeavour is assigned to the front line of emergent situations, confronting volatile scientific or diplomatic challenges, particularly those with significant unknown factors, while ably defending herself.
• Kortar: In service to the Klingon House of A’trok, close allies of the House of Koloth, the Kortar is a bird-of-prey capable of missions of patrol, escort, and reconnaissance. As part of the Fourth Fleet, she provides support in tactical and scouting operations.
• Decimus: A Romulan warship, the Decimus provides significant tactical support to Sirius Squadron, and scouts and assesses stellar phenomena. Her primary role, however, is in leading and supporting operations that pursue Republic interests and advance the Republic-Federation alliance.

With each ship answering directly to Commodore Rourke, the day-to-day oversight is handled by Commander Harrian Cal, Squadron Strategic Operations Officer, who liaises with commanders and wider unit needs. Unlike the other sub-units of Sirius Squadron, there is no formal division commander.