Code 9 being brought online

Code Nine is an emergency code which can be activated whenever Stargate Command is deemed to be under attack from an enemy inside the base. It is activated by pushing an emergency button or by declaring a code nine. (SG1: "Spirits")

In 1999, Captain Samantha Carter immediately activated it because of the appearance of Reetou Rebels who had launched a surprise attack on the SGC. (SG1: "Show and Tell")

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