From Steve Birdsell's wonderful book on the 5th AF "Flying Buccaneers"
"At Hollandia in July 1944 there were experiments using the A-20 as a rocket carrying plane, but the launching tubes reduced cruising speed by fifteen miles and out and the cut in range was too great a sacrifice"
"All found the rockets unsatisfactory; "Jock Henebry (3rd Attack Group C0) says it was 'a real aerodynamic abortion and a one shot deal' that was soon abandoned."