Give the troops a getIn waypoint near an H (or an invisible H). Give the Chopper a Load Waypoint at the H /invisible H. Synchronise the two waypoints.
If you don't want the chopper to arrive until the loons are ready then in the infantry waypoint before the GetIn waypoint put in the activation field:
ChopperGo = true
In the chopper's waypoint before the Load waypont put in the Condition field:
ChopperGo
Choppers can be funny. You might need to play with it a bit, and make sure you use a H or invisible H and put it on some flat ground.