The Pentagon set up a system in Defense Secretary Pete Hegseth's office that enabled him to check messages on the encrypted messaging app Signal while at the office, sources familiar with the matter told CBS News. Two of the sources said the system bypasses standard Defense Department security protocols.

The Department of Defense (DOD) is again under scrutiny after a turbulent week of departures, and a second reported Signal group chat involving Secretary of Defense Pete Hegseth.Here's a look at the latest on the DOD shakeups.

Joe Kasper, Hegseth’s chief of staff, is the fourth top official to be ousted in the last week amid turmoil at the Pentagon.