She had become a ballistic missile, aimed at some unknown target on Europa.

The unknown target immediately popped into clear view.

The patrol that had fired on the unknown target had been patrolling this desolate, barren area.

They will have failed to achieve it because it was an 'unknown' target.

Report your target, the Brig was hedgin& it was a dangerous decision to call the strike on an unknown target.

Still, this blind dealing with an unstoppable computer against an unknown target was wearing on him, as it was on everyone else.

"Either way," Feeney pointed out, "it puts you in the crosshairs and some unknown target on countdown."

There were simply too many American planes and helicopters flying around in the darkness over Cuba to allow people to blaze away at unknown targets.

Valentine hoisted him into the engine compartment as the gunner opened up on some unknown target.