Team Ro

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

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.
 * 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, Yamato and two others
 * Outcome: Success

Investigate barrier transgression
After several episodes 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: Partially 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. Team Ro was instead assigned to look for survivors, finding only one and bringing him to the hospital.
 * Assigned to: Presumed All
 * Outcome: Failure

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.