Another major vacancy will open up later this week: Bill Miller, the State Department Acting Secretary for Diplomatic Security, will leave the department on Friday. Miller himself is also retiring, but officials familiar with the situation say that retirement was not his first choice.

A career foreign service officer, Miller has led the office since 2014 and previously worked in Iraq, Egypt, Pakistan, Jerusalem and the Philippines. The diplomatic security office, which oversees the security for every U.S. embassy in the world, also has a number of lower-level officials that are preparing to retire, according to State Department employees familiar with the office. No appointee has been announced to fill Miller’s shoes.