Yes Cold, I guess my question about the canopy rail was really meant for all types designed after the F-16. If they were able to attain pretty much perfection in terms of pilot visibility in 1974 with no obvious increase in the danger of bird-strike etc (surely there would have been a redesign in the last 40 years if there was an increased danger), then why has every aircraft (excluding the F-35, the reason for which you have given) retained the visibility-limiting rail?