Within the Grand Army of the Republic, "Red Zero" was the request for immediate evacuation. This emergency command was used when encountering a disaster of some kind which must be very serious. A Red Zero always had top priority and would be transmitted to all ships and vessels within reach as well as to the operational HQ.
367 days after the First Battle of Geonosis, Omega Squad boarded a disguised Separatist transport during a TIOPS mission. One of the legitimate freighters traveling in the three ship convoy fired on the TIV, unaware that it was a Republic special forces ship. This caused a serious hull breach and forced Omega to signal a "Red Zero". Captain Ordo in Coruscant HQ received the message and relayed it to fleet command; RAS Fearless, Majestic and Delta Squad (on board a captured Neimoidian vessel) responded to this request. Eventually, Omega was saved by Delta Squad, who reached their position first, and Fearless, who saved them from a Separatist attack ship.
- Republic Commando: Triple Zero (First appearance)