From Halopedia, the Halo wiki
Lima Foxtrot Alpha 19, or LFA-19, was a Class-3 Enclosed Heavy Lifeboat attached to the UNSC cruiser Pillar of Autumn in 2552.
During the Battle of Installation 04, the pod was among many that landed on the installation. After the Flood outbreak, a shell-shocked Marine from the 79th Infantry Battalion sent a high-priority distress call through LFA-19's transmitter. The transmission was later retrieved by the Office of Naval Intelligence, and analyzed as a part of the ongoing investigation of the Flood threat.