There will be a lot on the plate for new Defense Secretary Pete Hegseth when he steps into his office on the Pentagon’s third floor E Ring.

When Defense Secretary Pete Hegseth starts his first official day on Monday morning, he will face a daunting array of issues to tackle — from global conflicts and border security to administrative tasks.

After being sworn-in by Vice President JD Vance, the Pentagon’s new leader addressed the Defense Department’s three million employees.

Pete Hegseth arrived at the Pentagon for his first day serving as President Donald Trump's Secretary of the Department of Defense.