Lima Foxtrot Alpha 19
From Halopedia, the Halo wiki
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 was analyzed as a part of the ongoing investigation of the Flood threat.