covert operation

Long enough to learn all about the world of human covert operations.

This was one of the agency's few covert operations that worked too well.

Miller never did find out how to set up a covert operation.

The problem is that for many, getting to the office has become a covert operation.

And again, I want to go back to the whole intent of a covert operation.

In that sense it had been a perfect covert operation.

He had seen too many covert operations not to feel vulnerable.

Every single one of them has been out on covert operations.

On a covert operation, everything has to be left exactly as you find it.

He's in charge of domestic and international covert operations for the army.