Since satellite communications were a thing of the future, one of the most daring long-range penetration operations of the Vietnam War was launched on April 19, 1968, by members of the 1st Air Cavalry Division's, Company E, 52nd Infantry (LRP), (redesignated Co. H, Ranger), against the NVA when they seized "Signal Hill" the name attributed to the peak of Dong Re Lao Mountain, a densely forested 4879 feet mountain, midway in A Shau Valley, so the 1st and 3rd Brigades, slugging it out hidden deep behind the towering wall of mountains, could communicate with Camp Evans near the coast or with approaching aircraft.