UNSC Iroquois
From Halopedia, the Halo wiki
Summary
The Iroquois is an UNSC ship commanded by Jacob Keyes during the Battle of Sigma Octanus IV. This ship was one of the UNSC's newer model, leaving Space Dock at Reach only 3 months before the battle at Sigma Octanus IV. The Iroquois is armed with 2 MAC cannons, 26 oversized Archer missile warheads, and 3 Shiva nuclear warheads. Covered with 2 meters of titanium-A battleplating, the Iroquois could dish out and take a tremendous amount of punishment.
During the battle at Sigma Octanus IV,4 dozen UNSC ships engage 20 Covenant craft. Seven human craft survive. The Iroquois destroyed a stealth ship receiving an encrypted transmission from the surface. Once this ship is destroyed, the surviving Covenant ships break off and flee. The Iroquois heads back to Reach for debriefing, but unfortunately, a Covenant ship tracked the motions of the Iroquois, and transmitted every location the Iroquois was at. This is how the Covenant found Reach.
