Palm Circle: the secret Hawaii bunker that planned Japan’s defeat

Richardson’s Palm Circle War Machine at Fort Shafter

In August 1943, Fort Shafter’s Palm Circle in Hawaii changed from a quiet Army post to the brain of America’s Pacific war machine. Lt.

General Robert Richardson took command and quickly got to work.

He turned old barracks into war rooms where his team planned the major island assaults that won the Pacific.

Within months, engineers built the "Pineapple Pentagon" in just 49 days, complete with underground bunkers and secret tunnels.

From this hub, Richardson led the massive supply chain that kept troops fed, armed, and moving toward Tokyo. The historic Palm Circle still stands today, a hidden gem where America’s Pacific victory was truly engineered.

A General Takes Charge of the Pacific War Machine

In August 1943, General Robert Richardson Jr. became the top Army leader in the Central Pacific at Fort Shafter, Hawaii.

He worked right under Admiral Nimitz, making him the first Army general to serve under Navy leadership. Richardson handled all the Army’s behind-the-scenes work while Nimitz ran the battles.

From his Hawaii base, Richardson managed thousands of soldiers spread across many Pacific islands. He ran the huge supply operation that kept the Pacific war going from 1943 until Japan gave up in 1945.

Palm Circle Transforms from Barracks to War Headquarters

The quiet barracks around Palm Circle quickly became a busy command center when Richardson’s team moved in. Workers tore out the old living spaces and filled them with desks, maps, and radios.

The headquarters changed names several times: Central Pacific Area (1943-44), Pacific Ocean Areas (1944-45), and Middle Pacific (1945-47).

By mid-1944, Richardson’s staff at Fort Shafter took care of supplies, medical needs, and paperwork for every Army soldier fighting in the Central and South Pacific.

The once-quiet post became the control center for half the Pacific War.

Engineers Build the "Pineapple Pentagon" in Just 49 Days

Army Engineers did something amazing in 1944 when they built Richardson Hall, nicknamed the "Pineapple Pentagon. " They put up three buildings (T-100, T-101, and T-102) in just 49 days to fit Richardson’s growing team.

The buildings had deep underground bunkers to protect against bombs. Strong tunnels linked the buildings so staff could move safely during air raids.

Tunnel 103 served as the command center, while tunnels 113 and 114 held other key operations. These buildings on Palm Circle’s east side became the heart of Army work throughout the Pacific War.

The First Island Target: Taking the Gilberts

Richardson’s team faced their first big test in November 1943 with Operation Galvanic, the attack on the Gilbert Islands. They aimed to take Tarawa and Makin atolls as stepping stones toward other islands.

From November 20-23, American troops fought to grab these Japanese bases. Richardson’s staff moved troops, gear, supplies, and medical help to these far-off spots.

General King’s medical team set up care for six divisions that came through the Central Pacific Area during 1943-44. The Gilbert Islands fight gave Richardson’s team good practice for planning later, bigger attacks.

Marshall Islands Fall in Rapid Succession

Operation Flintlock began in early 1944 as Richardson’s team planned attacks on Japanese bases at Kwajalein, Eniwetok, and Majuro. American forces took Majuro in just one day on January 31 without losing anyone.

The quick wins in the Marshalls proved the Central Pacific route offered the fastest way to Japan. Richardson’s staff picked Eniwetok as key for building airfields needed for the coming Marianas campaign.

The faster-than-expected wins made military leaders commit more to the Central Pacific push rather than focusing only on General MacArthur’s Southwest Pacific campaign.

Cairo Conference Added War Campaigns in 1944

The Cairo Conference in November 1943 added the Marianas to America’s target list, setting June 15, 1944, as attack day. Richardson’s team at Fort Shafter worked around the clock planning the huge operation.

The Marianas were special because they put Japan’s cities within reach of the new B-29 bombers. American forces landed on Saipan in June 1944, then Guam and Tinian in July under Operation Forager.

Richardson’s staff moved thousands of troops, vehicles, weapons, and supplies for these complex attacks. Taking these islands put American bases just 1,600 miles from Japan.

Hawaii Becomes a Massive Training Ground

General Richardson turned the Hawaiian Islands into a giant training center for troops heading to battle.

His staff built five beach landing training bases, three on Oahu at Waianae, Waimanalo, and Waipio, plus more on Maui and Kauai.

In October 1943, Transport Division 20 trained the Army’s 27th Infantry Division on Kauai, Molokai, and Kahoolawe.

Richardson’s command taught soldiers how to fight in jungles, storm beaches, and live in the tough Pacific setting.

The training grew into one of the biggest military schools ever made, training thousands of troops each month.

Palau and Guam Operations Clear Path to Philippines

Between June and November 1944, Richardson’s team supported Operations Stalemate and Forager, targeting Palau and the Marianas.

Marines and Army troops landed on Peleliu and Angaur in Palau that September, facing tough fights before winning both islands by November.

Meanwhile, after hard battles, American forces took Saipan in July, followed by Guam and Tinian in August.

Richardson’s staff quickly started huge building projects, making airfields on Saipan and Tinian for B-29 bombers. These new bases put American planes within striking distance of Japan.

Okinawa Invasion Marks Final Push Toward Japan

On August 1, 1944, Richardson’s command grew again, becoming US Army Forces, Pacific Ocean Areas. This new setup brought all Army forces from both Central and South Pacific Areas under his control.

His staff then started planning for the Ryukyus campaign, which began on March 26, 1945, with the capture of small islands near Okinawa.

The main attack hit Okinawa on April 1, leading to some of the war’s hardest fighting that lasted until June.

Richardson’s medical planners created standard support packages for the reinforced divisions used in island attacks.

B-29s Launch Strategic Bombing Campaign from New Bases

The first B-29 bombing mission against Tokyo took off on November 24, 1944, with 111 bombers flying from the Marianas bases that Richardson’s command had helped build.

As Marshall and Mariana islands fell to American forces in summer 1944, Army engineers rushed to build airfields big enough for the massive B-29 Superfortress bombers. These new bases let America bomb Japan directly.

The central Pacific push that Richardson helped plan and support had reached its main goal, bringing American airpower within range of Japan.

B-29s from Saipan and Tinian kept bombing Japan until the war ended.

Richardson Watches Japan Surrender on USS Missouri

General Richardson stood among the front row of Allied leaders who witnessed Japan’s formal surrender on the USS Missouri on September 2, 1945.

This moment marked the successful completion of the Pacific campaign he had helped manage for over two years. After the war ended, Richardson continued to command the Hawaiian Department and U.

S. Army Forces in the Middle Pacific until October 1946, when he reached the mandatory retirement age of 64.

Fort Shafter remained the senior Army headquarters for the Pacific region, while the 25th Infantry Division moved to the larger Schofield Barracks.

In 1947, the headquarters received its final name change, becoming U. S.

Army, Pacific (USARPAC), continuing the legacy Richardson established during the war years.

Visiting Palm Circle (Fort Shafter), Hawaii

You need a DoD ID card to visit Palm Circle at Fort Shafter, where General Richardson ran Pacific operations during World War II.

Civilians can’t take public tours, but military sponsors can get visitor passes after background checks. Enter through Buckner Gate anytime or Patch Gate weekdays 5am-9pm.

You’ll need REAL ID starting May 2025.

This National Historic Landmark from 1987 has markers explaining its wartime role as the Pacific command center.

This article was created with AI assistance and human editing.

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