The Navy is looking to increase its use of drones that are more and more independent of direct human control. In recent days, Pentagon officials and Navy leaders have spoken about the program and the push to develop more autonomous and intelligent unmanned systems. Secretary of Defense Ash Carter in a speech earlier this month confirmed that the United States was developing self-driving boats which can network together to do all kinds of missions, from fleet defense to close-in surveillance." And Rear Adm. Robert P. Girrier, the Navy's director of Unmanned Warfare Systems, discussed the effort at a January event at the Center for Strategic and International Studies. The drive is being dubbed "human machine teaming," which uses unmanned vehicles that are more independent than those piloted or supervised by human operators. Girrier told the audience that the "technology is there" and that more autonomous drones would allow the United States "to achieve supremacy at a lower cost." The Navy's push comes despite critics expressing increasing alarm at further automating drones, advances that have sparked fears of militaries developing robots that can kill without accountability. In July a group of concerned scientists, researchers and academics ... argued against the development of autonomous weapons systems. They warned of an artificial intelligence arms race and called for a "ban on offensive autonomous weapons beyond meaningful human control."