This is an simple and easy tutorial to make units come down from drop pods via triggers.
So create a new map or use a existing one and do this:
Events Map Initialization
You can use any other event (i.e. unit enters region, time elapsed, etc.) for that if you want to. Go to the terrain editor, and click on points, then set the point where you want your units to drop at. In this case mine will be called "Drop Pod Reinforcements."
Go back to the trigger editor and put under actions: "Unit - Create 1 Unit at Point for player 1 Facing 270 degrees (No options)" Fill that in to your specifications. Create a global value called "Drop Group" Then, use the add units to unit group trigger. Your trigger should now look like this, mine will be changed because I edited it to drop in 3 medics:
Events Map Initialization Local Variables Conditions Actions Unit - Create 3 Medic (Unnamed) for Player 1 at Drop Pod Reinforcements Facing 90 degrees (No options) Unit Group - Add all units in (Last created units) to Drop Group
Then use the campaign create zerg drop pod at point with unit group, change zerg to terran and fill in the fields. The final result will look like so:
Events Map Initialization Local Variables Conditions Actions Unit - Create 3 Medic (Unnamed) for Player 1 at Drop Pod Reinforcements Facing 90 degrees (No options) Unit Group - Add all units in (Last created units) to Drop Group Campaign - Create Terran drop pod at Drop Pod Reinforcements with Drop Group
Hope my grammer wasn't too bad that nobody could understand me and, hope this helps!
1.30623373660085