U.S. Navy Vice Adm. Jon A. Hill assumed responsibility of the Missile Defense Agency from U.S. Air Force Lt. Gen. Samuel A. Greaves during a change of responsibility ceremony, May 31. 

The Honorable Michael D. Griffin, Under Secretary of Defense for Research and Engineering, presided over the ceremony held in the Thurman Auditorium, Humphreys Hall, Fort Belvoir, Va. 

Greaves had led MDA since June 16, 2017 and will retire from active duty at the end of June 2019 following 37 years in uniform. 

“It has been a privilege and honor to lead the men and women of the Missile Defense Agency in developing effective and proven missile defenses for the protection of our homeland and our deployed forces, allies and partners,” said Greaves. “Their devotion to excellence to meet the objectives of the MDA mission is critical to the safety of our nation.” 

Vice Adm. Hill has served as MDA’s deputy director since November 2016. As director, he will advise the undersecretary of defense for research and engineering on ballistic missile defense policy, requirements, priorities, systems, resources and programs and lead MDA’s more than 8,000 military, civilian and contract employees working in locations across 14 time zones. 

“I look forward to continuing to serve with the men and women of this agency to meet the critical mission of developing a (ballistic missile defense) that defends our nation, deployed forces and its allies,” said Hill. “We will continue to pursue excellence in all we do to support the warfighter and prove the power of missile defense through testing.”