Team Ro

Team Ro is an elite Anbu unit of Konohagakure that serves directly under the Hokage.

Eliminate shinobi from Kirigakure
Team Ro was once tasked to kill hostile shinobi from Kirigakure, who were all eliminated during their escape.
 * Assigned to: Kakashi Hatake, Tenzō
 * Outcome: Success

Eliminate all hostiles
Team Ro members, Kakashi and Itachi, were sent to watch over the exchange of information between a team from Konohagakure and the Prajñā Group of the Land of Woods. In the likely event of betrayal, they were to eliminate all opposition which actually happened, as the Prajñā Group indeed attempted to betray Konohagakure.
 * Assigned to: Kakashi Hatake, Itachi Uchiha
 * Outcome: Success

Eliminate the saboteurs from Kusagakure
One time, five shinobi from Kusagakure tried to sabotage a street by burying explosive tags. Team Ro was tasked to kill them on the spot without leaving any traces that could burden Konohagakure.
 * Assigned to: Kakashi Hatake, Itachi Uchiha, Tenzō and two others
 * Outcome: Success

Investigate barrier transgression
After several instances of an intruder bypassing the Konoha barrier system around the Uchiha clan district, Kakashi was tasked with investigating. Unable to uncover the perpetrator, Kakashi reported his findings to the Third Hokage.
 * Assigned to: Kakashi Hatake
 * Outcome: Partial Success

Intercept Coup d'État
Team Ro accompanied the Third Hokage to the Uchiha clan district in order to pacify the Uchiha and thus averting civil war. Their efforts however turn out to be irrelevant, due to the slaughter of the majority of the clan by Itachi.
 * Assigned to: Presumed all
 * Outcome: Failure

Treat Sasuke Uchiha
The sole survivor of the Uchiha Clan Massacre, Sasuke Uchiha, was found by Yūgao Uzuki, a member of Team Ro who was tasked by Hiruzen Sarutobi to ensure Sasuke's survival by bringing him to the Konoha Medic Corps.
 * Assigned to: Yūgao Uzuki
 * Outcome: Success

Dispose of the corpses
Directly after the slaughter of the Uchiha clan, Team Ro and the other present Anbu units were tasked to take away the corpses which was a tremendous mission even for Anbu standards.
 * Assigned to: Presumed all
 * Outcome: Success

Trivia

 * During the Invasion of Konoha, an Anbu team named "Ro" was tasked to protect the present ministers. It's unknown if this was this particular team or a different one.