Black Cat-class subprowler
Designated as "subprowlers," they have extremely limited capabilities and are used mostly as exfiltration craft to escape combat situations with stealth and ease. The Black Cat-class subprowlers have slipspace capacitor of limited use; the capacitor has enough charge for about four hours. Once the capacitor exceeded this duration, the vessel would not be able to enter slipspace.
Black Cats are routinely used on high-risk operations so that UNSC Special Forces can retreat quickly and easily, as well as reconnaissance, and troop infiltration and exfiltration missions. Each subprowler can hold approximately thirty-eight Spartan-III supersoldiers.[note 1]
Black Cat-class subprowlers were in service with the UNSC Navy in the early 26th century. Eight such craft were inserted for the Spartan-IIIs during Operation: TORPEDO in 2545, but only one was used as only two Spartans, Lucy-B091 and Tom-B292, survived the engagement. After the Human-Covenant War, the Office of Naval Intelligence designed the Winter-class prowler with the Black Cat-class subprowler's form and functionality in mind.
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