During his tenure, from 1976 to 1982, with the U.S. Department of Defense's Advanced Research Projects Agency (DARPA), Cerf played a key role leading the development of the internet, and internet related data packet and security technologies. | During his tenure, from 1976 to 1982, with the U.S. Department of Defense's Advanced Research Projects Agency (DARPA), Cerf played a key role leading the development of the internet, and internet related data packet and security technologies. |