GOOGLE PDF viewer ofUSAF history page. 27 Dec 1935 Five Keystone LB-5 bombers of the 23d and 72d Bombardment Squadrons at Luke Field dropped twenty 600-pound bombs in the path of a lava flow from the Mauna Loa volcano on the Big Island. The lava threatened the city of Hilo when Mauna Loa erupted. The squadrons were credited with diverting the lava flow.