As everybody here probably knows, USAF F-105 Thunderchiefs and USN A-4
Skyhawks bore the brunt of the Rolling Thunder campaign from 1965 to
1968 and suffered accordingly. The F-105 and A-4 losses over North
Vietnam were 282 and 173 respectively.

Now the harder part. What were their loss rates (losses/sorties) and
how they compare? What factors contributed to the difference?