Complete the following sentence: The Lightning Bug program had proven highly successful. <unk> <unk> <unk> <unk> <unk> Despite this, Lightning Bugs could not affect the course of the war.<unk> Despite this, Lightning Bugs could not affect the course of the war. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ When the North Vietnamese began their last offensive in early 1975 the U.S. did little to stop it; when the North Vietnamese began their last offensive in early 1975 the U.S. did little to stop it;
Saigon fell on April 30, 1975 and the war was over.<unk> Saigon fell on April 30, 1975 and the war was over.