Fury tactical nuclear weapon
From Halopedia, the Halo wiki
A Fury TAC-nuke is more or less a nuclear grenade. The Fury is about the size and shape of an overinflated football . It has a blast radius of about 1.2 km and is extremely clean.
During the attack on Reach, Spartans Fredric-104, Kelly-087, and Joshua-029(AKA Alpha Team) destroyed a Covenant Cruiser by capturing a pair of Banshees and throwing a Tactical Nuke into its grav-lift.