On the surface, left-leaning Silicon Valley and the more conservative US military seem worlds apart.

The Pentagon emphasizes a strict chain of command that filters ideas through layers of bureaucracy.

But the Pentagon s Defense Innovation Advisory Board continues to bring the two together, even as Silicon Valley leaders face growing public pressure to back away from the Trump administration.

The fact that Silicon Valley s current advisory role to the Pentagon has proven substantially less controversial than its White House parallel is not without irony.

To date, the board s seemingly nonpartisan ideas have been well-received within the defense policy community, Singer says.

But he cautioned that ordinary bureaucratic resistance could slow adoption of its recommendations, unless Mattis and senior Pentagon leaders make them a priority.

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