The simplest way would be to give everyone WPs. The chopper gets a Load WP and the troops get a Get In Wp. Then an Unload Transport and Get Out WP. The troops go off in one direction and the Chopper Gets a Move WP back to Where it started. Then a Load and Get In WP for the next lot of people.
You could do it with triggers and no Wps, but I think that way would be overly complex.