The terms of Google's classified Pentagon agreement are the part of this story that the simultaneous drone swarm exit obscures. The contract — signed for 'any lawful government purpose' — includes advisory prohibitions on mass surveillance and autonomous weapons without human oversight, but those guardrails are adjustable on government request. The more than 580 employees who signed letters urging Pichai to refuse did not extract a commitment against adjustment. What they got was a withdrawal from one contest and an expansion of the…