Knife 26
From Halopedia, the Halo wiki
Knife 26 was a UNSC Longsword fighter.
In 2552, Knife 26 was embarked aboard the UNSC Pillar of Autumn. With a female pilot it saw action at the Battle of Reach where it led a flight of four Longswords escorting SPARTAN-II Red Team aboard Pelican Bravo 001. En route Knife 26's flight was engaged by a dozen Seraph fighters, and Knife 26 was subsequently destroyed.