There had been no security patrol over the gravel surface for at least four hours.

The security patrol should be back this way any minute.

In a show of force, marines increased security patrols around the city.

Nonetheless, the university said it had increased its security patrols.

The prison officer using his eyes and ears is the first security patrol.

If they were the security patrol, he would ask them to stay with him awhile.

The security patrol was about a hundred yards out and closing fast.

I had to slip past the security patrols, get myself up to the launch site.

I don't want you walking alone at night unless there's some sort of security patrol on the premises.

The Endeavour is on security patrol and won't return for at least three weeks.