Wurger and friends, while the official documents called for the change from OD41 to ANA613 Olive Drab in 1943, the reality is that the USAAF HATED the new color and continued to use OD41 for camouflaged aircraft for the remainder of WWII - no matter WHAT the official spec called for. There is some question as to whether the A-20s that were bound for the USSR may have been painted in ANA613 (but no answers yet), but anything painted for the USAAF was OD41 off the production lines if it was painted at all.
AlanG