This places the split point based on the best path from the IP to home,
rather than the best path from home to the target. The outcome is that
the planner might choose an alternate route out of a threatened area
based on the safest escape from the IP, which is where the aircraft
should be when it releases its weapons, rather than at the target.
That's of course not always perfect since the IP distance is not based
on the carried weapon, but it's a better choice when it matters more
(when carrying standoff weapons attacking a more dangerous target).
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