In this instance the military tracked where on the planes that came back but had received significant damage. The idea being to reinforce the parts where they never have damage . The planes that take damage there don’t come back.
My understanding is the initial plan was to reinforce where all the bullet holes had occurred. It was then pointed out that the planes were able to return with these bullet holes. Planes weren’t returning where there were no bullet holes (i.e. clear space on the picture) so those areas should be reinforced to improve survivability.
In this instance the military tracked where on the planes that came back but had received significant damage. The idea being to reinforce the parts where they never have damage . The planes that take damage there don’t come back.
My understanding is the initial plan was to reinforce where all the bullet holes had occurred. It was then pointed out that the planes were able to return with these bullet holes. Planes weren’t returning where there were no bullet holes (i.e. clear space on the picture) so those areas should be reinforced to improve survivability.