When using the Orbit/Circle triggered command, AI helos act strangely. As can be seen in the attached trk file, once the helo enters the trigger zone, the ORBIT triggered command is activated, BUT, the helo goes back to the previous waypoint to carry out the orbit and does not orbit in the trigger zone. Thus meaning, you have to set a waypoint at the edge of the trigger zone, to keep the helo orbiting in the area you require.
If designers are unaware of this, it can lead to the helo orbiting at far greater distances than they are designed or desire.
AI Orbit .trk