During World War II, the US military built bunkers on top of Koko Crater with a railroad leading to its summit. In 1966, the air force ceded administration of Koko Crater over to the City of Honolulu.
During World War II, the US military constructed fortifications on Koko Crater with a railway leading to their highest point. In 1966, the air force transferred control of Koko Crater to the City of Honolulu.