Atlas booster engine, XLR-89-NA-3, installed as one of two outboard booster engines to propel the Atlas missile at launch, had a thrust of 165,000 pounds with a burn time of 270 seconds.
"Atlas booster engine, XLR-89-NA-3, installed as one of two outboard booster engines to propel the Atlas missile at launch, had a thrust of 165,000 pounds with a burn time of 270 seconds. " appears in: Sands Space History Center