Re-reading Dana Bell's excellent book on the A-10 (D&S vol. 19), I see the integrated chaff/flare dispensers at the wingtips and gear nacelle ends were added with S/N 77-227. There are a LOT of Hogs built prior to this serial number. Were any of the earlier aircraft back-fit with these integrated dispensers? Given the importance of expendables in protecting an aircraft in the high-threat CAS environment, I imagine some means of protection was provided. If not refit, were the earlier birds relegated to training or other second-line roles?