Paladin Team Sigma-Alpha 2

Paladin Team Sigma-Alpha 2 is a team of G.U.N. troopers. They were responsible for the capture of Sonic the Hedgehog who had been framed for the theft of a Chaos Emerald that had actually been stolen by Shadow the Hedgehog, although Sonic escaped their custody while flying in a helicopter. The team would meet Sonic again as an ally during their mission to defeat the evil Dragon, Zan.

Search for Sonic the Hedgehog
One of Paladin Team Sigma-Alpha 2's first known operations was their mission to capture Sonic the Hedgehog, when they believed he was responsible for stealing the city's Chaos Emerald. In reality, the emerald was stolen by Sonic's look-alike Shadow the Hedgehog. Although Sonic was captured by the team despite putting up resistance, he managed to escape from their helicopter while being transported to prison. Eventually Shadow's identity became known, and Sonic was exonerated for the crime. (StH: #98)

The Dragon Conflict
Almost a year later, Paladin Team Sigma-Alpha 2 were once again deployed, this time to work with Sonic and the Knothole Freedom Fighters in bringing an end to the terror brought on by the dragon Zan. Sigma Alpha 2 planted the explosives in the dragon's cave that resulted in his death. In exchange for the Freedom Fighter's help and information on Dr. Eggman, Station Square accepted the numerous Overlander refugees that the Freedom Fighters had rescued from Robotropolis. (StH: #106, #107)

Later Missions
During the Xorda's attack on the planet, Sigma-Alpha 2 were among the G.U.N. soldiers on the field of battle against the Quantum Dial. (StH: #125)

Background information
Paladin Team Sigma-Alpha 2 were named after the group of GUN agents that had arrested Sonic and were taking him into custody via a helicopter at the beginning of the hero story in Sonic Adventure 2.