depends on what kind of patrol, if you want a
slow death patrol
with guns out through a war zone, then you put their waypoint on safe, limited speed, and in each ones init field you put: this setunitpos "up"; then they will walk upright the entire time guns aimed and when they encounter an enemy will simply shoot him, no ducking, no nothing they'll just cap him like a death patrol going through killing the injured.
for a routine, going through safe territory patrol
then you just don't put in the setunitpos "up" and they'll duck when they encounter the enemy and all that, but for a city patrol do the above.
those are the only two types of patrols i can come up with.