The G3 Military Assessment Survey, or G3 Intelligence, was a unit in the Sontaran military responsible for threat assessment.
In 2371 G3 Intelligence broke down and analyzed the Rutan access codes. (PROSE: Lords of the Storm)
In 16087, Field Major Styre lured a group of soldiers from GalSec to an abandoned Earth in order to assess humanity's military skills for a Sontaran invasion of the Mutter's Spiral. (TV: The Sontaran Experiment)