Nearly two weeks after he submitted his resignation letter, former Defense Secretary James Mattis has officially left the Pentagon. The building already feels like a less lethal place.

The legendary Marine general has been replaced by former Boeing executive Patrick Shanahan, who has a reputation for being able to solve complicated problems. (As the Pentagon's space guy, he is also the defense official whom your friendly Pentagon correspondent once asked if Space Force needed a Starfleet Academy and rifle squads to "seek out and destroy other lifeforms.")