Rood will fill the third top civilian role at the Defense Department with responsibility over homeland defense, arms control, assessment of war plans, bilateral relations with allies, technologies and regional policies associated with combatant commands.
His confirmation came nearly three months after the Trump administration nominated him for the post.
Rood joined Lockheed in 2014 after time as VP for U.S. business development at Raytheon.
He has two decades of government experience at several federal agencies such as the departments of State and Defense, CIA and the National Security Council.
David Trachtenberg, who has been acting DoD undersecretary for policy since October, will transition to deputy role as a result of Roodâs confirmation, the report added.