S3 Series

Jabo,
What is considered enough damage to get points for a target?
Like 171 has a long bridge and a gun way off the base, does it all have to be destroyed (i.e. closed) to count or just 51% destroyed?

You need to close locations to score points. Some items are not required to close but bridges are.
That being said you can cherry pick targets for points. Go for parked a/c at airfields and static ships at ports. Those score points.
AI shipping and a/c as well. Look for Ju52s taking off wounded soldiers from their rear bases and heading to the west.