>Lifted off the ground, the pig began to spin as it flew through the air at 125 miles per hour (200 km/h). It arrived on board uninjured, but in a disoriented state. When it recovered, it attacked the crew.
Iranian Air defense getting lucky is different to it being impenetrable.
This is not a binary situation, and a lucky F-15 kill would not make it a good idea to concentrate more assets in an area where the US will now focus more resources.
