11.   Last year, the company was put on probation for hiring people with criminal records to staff security checkpoints at Philadelphia International Airport.

12.   Most of the exercise will require long days of hard training for peacekeeping duties ranging from staffing traffic checkpoints to coping with sniper fire and minefields.

13.   The administration was not inclined to make federal workers of all security personnel at airports, those who staff security checkpoints for passengers and carry-on bags, for example.

14.   The situation calmed after police and village officials agreed late Tuesday to have mixed ethnic patrols staff the checkpoint in the future.

15.   The severe cold deters Chinese patrols in the winter months, including March, when it is too frigid to staff border checkpoints.

16.   Troops continue to staff checkpoints, but traffic on the streets is gradually picking up.

17.   But the barriers will remain in place and officers will continue to staff the checkpoints on an irregular basis to maintain a deterrent effect.