 Complete the following phrase:  In January 1943, at the Casablanca Conference, the Allies formulated the Combined Bomber Offensive CBO plan for round-the-clock bombing  USAAF daytime operations complementing the RAF nighttime raids on industrial centers. In June 1943, the Combined Chiefs of Staff issued the Pointblank Directive to destroy the Luftwaffes capacity before the planned invasion of Europe, putting the CBO into full implementation. German daytime fighter efforts were, at that time, focused on the Eastern Front and several other distant locations. Initial efforts by the 8th met limited and unorganized resistance, but with every mission, the Luftwaffe moved more aircraft to the west and quickly improved their battle direction. In fall 1943, the 8th Air Forces heavy bombers conducted a series of deep-penetration raids into Germany, beyond the range of escort fighters. The 