1.   And quite often it er degenerated into an argument about picket duties.

2.   Crucially, U.S. and British forces will have to remain in the region in numbers and with firepower far beyond what would be required for mere picket duty.

3.   Destroyers on radar picket duty are the favorite targets of those bent on suicide.

4.   They said Ausin had formed part of a picket on Wednesday but maintained he was not on picket duty when he was killed.