Pentagon Policy Chief Kahl to Depart After NATO Summit.

Colin Kahl, the Pentagon's top policy official, is set to leave his post in July and return to his position as a tenured professor at Stanford University. Kahl has been a key player in shaping U.S. defense policy, particularly in synchronizing security assistance for Ukraine. Sasha Baker will take over his job in an acting capacity. Kahl had a tough confirmation battle two years ago and was rumored as a potential candidate to replace Jake Sullivan as national security adviser.