The ship was designed to handle seas far worse than this, but safety at sea demanded vigilance.

Religious hard-liners struck back with demonstrations demanding greater vigilance in public morality.

It would demand vigilance, but Ned had the necessary patience.

All rescue operations demand vigilance with regards to safety.

And for a player who is better known for his clothes than the company he keeps, it demands constant vigilance against bad losses.

Accusing the police of ignoring drug dealers in the neighborhood, parents demanded more vigilance and asked why the city had not acted sooner.

And success, Diana knew, was a greedy god who demanded constant vigilance.

The feelings aroused by certain current events therefore demand greater vigilance.

The moral geography of the Netherlands demanded constant vigilance.

Of course, as you say, "Soviet military capabilities demand counterbalance and vigilance."