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Pentagon chief of staff resigns

The Department of Defense's chief of staff Rear Adm. Kevin Sweeney has resigned, according to a statement.

Sweeney said in a brief statement that he planned to return to the private sector, giving no reason for his departure. His exit comes just days after Secretary of Defense James MattisJames Norman MattisBiden's is not a leaky ship of state — not yet Rejoining the Iran nuclear deal would save lives of US troops, diplomats The soft but unmatched power of US foreign exchange programs MORE, for whom Sweeney previously served, left the agency after announcing his resignation earlier in the month.

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"After two years in the Pentagon, I've decided the time is right to return to the private sector. It has been an honor to serve again alongside the men and women of the Department of Defense," Sweeney said in his announcement.

His resignation also followed that of another top Mattis ally, Pentagon spokeswoman Dana White, who announced her resignation at the end of December.

“I appreciate the opportunity afforded to me by this administration to serve alongside Secretary Mattis, our Service members and all the civilians who support them. It has been my honor and privilege,” White wrote on Twitter last month. “Stay safe and God bless.”

Mattis's resignation was thought to be tied to the surprise announcement from President TrumpDonald TrumpWarren says Republican party 'eating itself and it is discovering that the meal is poisonous' More than 75 Asian, LGBTQ groups oppose anti-Asian crime bill McConnell says he's 'great admirer' of Liz Cheney but mum on her removal MORE regarding the withdrawal of U.S. troops from Syria, where coalition forces continue to battle elements of the Islamic State in Iraq and Syria (ISIS) on the ground.

Trump's withdrawal of U.S. forces from Syria was also credited at the time with pushing the resignation of Brett McGurk, the president's top envoy to anti-ISIS coalition forces in the region.

Mattis's former deputy, Patrick ShanahanPatrick Michael ShanahanOvernight Defense: National Guard boosts DC presence ahead of inauguration | Lawmakers demand probes into troops' role in Capitol riot | Financial disclosures released for Biden Pentagon nominee Biden Pentagon pick could make up to .7M from leaving Raytheon Lloyd Austin can lead — as a civilian MORE, began serving as acting Defense secretary at the beginning of January.