The head of a Pentagon unit responsible for accelerating the military's adoption of new technology resigned on Monday, according to four people familiar with the matter, the latest exit of a senior military official whose political views have clashed with those of U.S. President Donald Trump.

Doug Beck, director of the Silicon Valley-based Defense Innovation Unit, told staff in an email that he was stepping down, the people said. He did not provide a reason for his departure in the email, but wrote that working at the DIU was "basically the greatest honor of my life," according to a person with direct knowledge of the email.

He wrote that the DIU will be transitioned to new leadership overseen by Emil Michael, the Under Secretary of Defense for Research and Engineering. "I will help,

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