The Chief of Staff to the Secretary of Defense, Eric Chewning, is resigning at the end of January. In a statement, Pentagon press secretary Alyssa Farah said Chewning “will be leaving the department at the end of January to return to the private sector.”
Chewning became the chief of staff to then-acting Secretary of Defense Pat Shanahan in last January.
Here's part of Secretary of Defense Mark Esper's statement:
"I'm grateful for Eric's professionalism, judgment, and leadership over the last seven months as I moved into the Secretary of Defense role ... In an incredibly demanding job, Eric has been a source of calm and tireless work. He will be missed by all. We wish him all the best upon his return to the private sector."
The announcement of the resignation was expected, but it comes as tensions with Iran are mounting.