Patrollers must commit to 20 days active patrol each season, regardless of weather.

She sank nine ships and damaged three more in ten active patrols.

The brigade routinely maintained a strong defense through offense by active patrols and show of strength.

The division engaged in active patrols in no man's land and behind the German lines.

Her first, and only, active patrol started on 15 March 1945.

In 2006 there were over 200 proficient club members rostered into 13 active patrols.

"Dad, we're losing nearly two-thirds of the new pilots in the first week they're assigned to active patrols."

As soon as this briefing was over, Mack and his officers would be ready to return to active patrol.

He recovered quickly, and in nine weeks was back on active patrol.

After a stay of about a month, the crew cast off on their first active patrol 3 November 1943.