Command control voice, a system that identified voice patterns, served as a method for controlling droids. It also allowed for the input of Command Control Instructions. Before the Battle of Tatooine, Captain Raymus Antilles assigned Princess Leia Organa as a command control voice for the droids R2-D2 and C-3PO. Utilizing this designated authority, the princess directed R2-D2 to protect the acquired Death Star plans and ensure their delivery to General Obi-Wan Kenobi on the planet's surface. R2-D2 interpreted these directives as his "mission" and persevered through many challenges until he accomplished it.