Try something like this instead of using a delay.
QUOTE(Trigger)
Current Player brings exactly 1 Nuclear Missile to 'Anywhere'.
Current Player brings exactly 0 Nuclear Missile to 'Silo'.
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Remove all Terran Ghost for Current Player.
Where the location "Silo" coveres the area where the missile flys out of the nuclear missile silo.
When the bomb drops, the ghost will be removed, regardless of the game speed.
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