"This development and sustainment contract proposal is backed by the full commitment of Boeing, Northrop Grumman and all of our team members," said Dennis Muilenburg, president and chief executive officer of Boeing Defense, Space & Security. "We have been privileged to have been partners with the Missile Defense Agency through the development and deployment of the GMD system and, now with Northrop Grumman, we will bring to GMD over 50 years of experience in sustaining and modernizing the Minuteman ICBM weapon system.