In 1944, the Army Corps of Engineers erected the "Pineapple Pentagon" (buildings T-100, T-101, and T-102) in just 49 days. Two large fishponds were filled in to form Shafter Flats. For most of the time since the Second World War, Fort Shafter has remained the senior Army headquarters for the Asia-Pacific region. In 1947, the headquarters was renamed U.S. Army, Pacific. The post continued to adapt to meet the Army's evolving requirements. In the early 1960s it was split in two by the new Moanalua Freeway. In 1974, when the headquarters was eliminated, Fort Shafter became home to U.S. Army Support Command, Hawaii, and the U.S. Army Corps of Engineers, Pacific Ocean Division (relocated from Fort Armstrong, (Hawaii)). In 1979, the Army established U.S. Army Western Command, which was renamed U.S. Army, Pacific in 1990. In 1983, the Army conveyed to the State of Hawaii of undeveloped land on the northern end of post. Today Fort Shafter remains the focal point for command, control, and support of Army forces in the Asia-Pacific region; it includes an underground command center beneath Palm Circle.