Many areas and mountains in the A Luoi region became historical in the mid-late 1960s during the Vietnam War, such the Battle of A Shau, the 5th Special Forces Camp that was overrun in 1966, as well as the 4,878-foot Dong Re Lao Mountain best known as the "Signal Hill" that was seized by 1st Cavalry Division LRRP / Rangers in 1968 during Operation Delaware.
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In April 1968 members of the 2nd Platoon, Company E, 52nd Infantry, 1st Air Cavalry Division, Long Range Reconnaissance Patrol (LRP), commanded by Captain Michael Gooding and Lieutenant Joseph Dilger, conducted one of the most daring long-range penetration operations of the Vietnam War when they seized the strategic 4,879-foot mountain peak of Dong Re Lao Mountain, dubbed "Signal Hill" by headquarters during Operation Delaware.