They scouted, probed, and analyzed us, and came up with several facts. Second, our ultimate collision is unavoidable. We’re starting to compete for the same space. Third, they are probably smaller than we, numerically weaker, as it were, but with a slight technological edge. They assume war, but they are not certain they could win it. If they had been sure they’d have attacked by now. That means they need information—lots of it. How our military organization is set up. How our defenses are established and would be used. And most important, how we think. A total understanding of us while we remained in ignorance of their ways would give them and their war machines a tremendous edge, assuming equal firepower. Fourth, they’ve been at this for some time, which means our collision is still way off, perhaps years. Finding us was probably accidental, some scout of theirs who got overextended, lost, or just overly ambitious. They’ve been around long enough, though, to make robots that pass for humans, to put spy stations in orbit around Military Systems Command, of all things, and to work out a deal with some of our own to help sell us out.”

The young man suddenly looked interested. “Ah,” he breathed.

“Exactly,” the commander grumbled. “The last deduction is that they themselves are physically so alien to us that there is simply no way in hell they could move among us undetected, no physical disguise even possible. That leaves human-mimicking robots—-who knows how many? I’m getting so I suspect my own staff—and human traitors. That last becomes the province of this office, naturally.”

In earlier times the Operational Security Office might have been referred to as a secret police, which it most certainly was. Unlike the earlier models, though, it had little to do with the day-to-day life of the citizenry in the specific sense. Its mandate was broader, more generalized.

Mankind had perfected a formula long ago, one that worked.