Help with GEM?
 

How do I make an endless enemy tank entry point in GEM?

Where one or more types of tank constantly enter on a time interval?

Ok, here a little tut:
1. spawn your tank, send a crew into it.
2. Push CTRL+T (open a tag menu) and add "hidden" (this make your tank dissapear at start of the mission, but you will be able to copy it) and then something else, adding a tag to unit is like give it name (besides hidden), i will use endless_tank for this tut
3. make a waypoint path
4. add this script:

Conditions
Event - endless_tank_spawn (while you will set event as condition, dialog will show up, click right mouse button and select add)

Waypoint
Who - actor
tag - endless_tank
copy - yes
waypoint - <number of waypoint which starts your path>
Event
event - endless_tank_spawn
toggle
time or something - time until next tank spawn

(If this won't work, mark autoreset)