Ryan Crocker, the U.S. ambassador to Afghanistan, is expected to step down this summer after a year in the job, two U.S. officials familiar with the matter told CNN early Tuesday.

Crocker was appointed to the post in Kabul on July 25 of last year. The relatively short length of his service in the Afghan capital is no surprise. In recent history, American ambassadors have served similar terms.

This is not Crocker's first stint in Kabul. After the Taliban were forced out of power, Crocker was given the task in 2002 of reopening the U.S. Embassy in the city, according to his State Department biography.