"Certainly I can agree with you that such duty is both dangerous and demanding."

Also during that time, he and Laura continued to see more of each other than duty demanded.

But she wasn't helping him and he was too proud to force her before duty demanded it.

As an officer he had fought to kill, and killed when duty demanded.

Walker took a breath and did what his duty demanded of him.

But can you kill him when your duty demands it?

His own duty demanded that he leave the danger zone so as to avoid trouble at the hands of the police.

Was that what my duty to Starfleet demanded of me?

Duty demanded that he push it from his mind until every alternative had been exhausted.

Duty at sea is demanding, and single men have fewer distractions.