Try to make one extra wp between Get In and Get Out, like this:
1 Get Out (leave all fields empty)
2 Move (in the Activation field you write chopperStart)
3 Get In (all fields empty
4 Move, or guard, or search and destroy or whatever
Now, make a trigger, of type radio alpha. In the "Text" box of the trigger you write Call Helo. Then make the rest of the trigger:
Condition: this
Activation: chopperStart=true
Now your team leader should have the option Call Helo, in his radio options. Yopu can either access it by pressing 0-0-1 or by hitting "M" on your keyboard and use the radio from your mission plan/map-page.