 In May 1965, Navy Seabees from Naval Mobile Construction Battalion Three (NMCB 3) started work on a very difficult job to construct a road from the north peak to the south peak of Monkey Mountain, and then construct a U.S. Marine Light Anti-Aircraft Missile battery (LAAM) atop the peak.The south peak originally was the size of a desk, but the top was removed through explosives to provide 15 to 20 acres of space for the missile battery, shops, and living spaces.NMCB-3 was relieved mid-way through construction by NMCB-9.