Yeah probably you're right THobson. I guess only one guard waypoint is required with a cycle waypoint after it.
One thing I've noticed though, is that if you put one seek and destroy waypoint down, and then a cycle waypoint after it, the group/unit will keep S&Ding until the cycle is broken.
If you put four S&D waypoints down, the group/unit will do all four, and then keep repeating the last one. What if the group/unit used guard waypoints the same way?