Please explain what isn't working. As for each unit spawning three times, which system are you using? If you're using the second one I explained, then try the first one.
Also, make sure you have it under ONE player, not the forces. If it still doesn't work, have a new trigger.
Trigger
Players
All Players
Conditions
Always
Actions
Set Switch 1
Then add the condition "Switch 1 is Set" to your Bunker triggers. This should help.