History of the Marine Corps

On 25 June 1950, the North Korean army crossed the 38th Parallel behind Soviet-built tanks and took Seoul in three days. The Marine Corps had 74,279 Marines on active duty, scattered around the world, and no unit of any size in the Far East.

This episode covers how Korea became divided and what the Corps did in the first weeks of the war. The long rivalry over the peninsula, two armies built on either side of a temporary line, Task Force Smith at Osan, a brigade assembled at Camp Pendleton in one week, and a reserve call-up that pulled World War II veterans and high school students out of their hometowns in 53 days. By mid-July, 6,500 Marines were at sea, bound for a shrinking corner of Korea called the Pusan Perimeter.

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On 14 November 1945, a train carrying the commander of the 1st Marine Division came under fire near a village called Kuyeh. The pattern it set would hold for the next three and a half years: an uneasy calm, an ambush, and a negotiated settlement that bought a little time before the next attack.

This episode follows the Marines through the rest of their time in North China. George Marshall's cease-fire and its collapse, seven Marines captured on an ice run, the ambush at Anping, two attacks on the ammunition dump, six dive bombers lost in a snowstorm over Shantung, and a withdrawal that ran regiment by regiment until one rifle company aboard a cruiser was all that remained. Eighteen months later, the 1st Marine Division met the same enemy at the Chosin Reservoir.

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On 30 September 1945, the 1st Marine Division anchored off the mouth of the Hai River and sailed into a hero's welcome. Crowds packed the banks at Tientsin, cheering veterans of Guadalcanal and Okinawa as they came ashore. Within a week, Marines were taking fire on the roads outside the city.

This episode tracks the Corps' turn from war to an impossible peace: the point system and the race to demobilize almost half a million Marines, the collapse of the old rank structure, and the III Amphibious Corps' arrival in North China to repatriate 630,000 Japanese soldiers and civilians.

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On 22 September 1945, the 5th Marine Division entered Sasebo Harbor under Japanese pilotage. Marines cleaned and stabilized a burned, silent city, secured depots and key sites, and watched a wary civilian population slowly reappear. From Sasebo, the division spreads across northern Kyushu, locking down airfields, rail junctions, coastal guns, and ammunition dumps, while also helping run repatriation and displaced-person processing. This episode tracks the shift from assault warfare to tense, day-to-day control: demilitarization, sanitation and disease prevention, restrictions on liberty, black markets, and the pressure of demobilization.

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This episode follows how Third Fleet rapidly built Task Force 31 into an occupation force, reinforced the 4th Marines for a potentially hostile landing, and seized key positions at Futtsu Saki and Yokosuka Naval Base. It covers the first hours ashore, the establishment of the initial occupation perimeter, the urgent rush to recover Allied prisoners, and the shift from invasion planning to guard duty, demilitarization, and air operations as the occupation settles in. With Tokyo Bay secured, the focus turns south toward Kyushu and the next phase of the occupation.

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This episode follows the Marines from the mud and caves of Okinawa into the strange, uneasy rehabilitation camps on Guam, Saipan, Motobu, and Hawaii, where exhausted divisions rebuilt, trained, and quietly braced for the largest amphibious operation in history—Operation Downfall. We break down how Marine divisions and air wings were wired into Operations OLYMPIC and CORONET, the internal fight in Washington over whether to starve, burn, or invade Japan, and how troops were reshaped for a direct assault on Kyushu and then the Tokyo Plain.

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This episode pulls together the long wars and the quiet missions that followed. It starts in Anbar and along the Syrian border, with Lioness teams at checkpoints, battalions fighting through al Qaim and Ramadi, and tribes turning against Al Qaeda. From there it tracks how Iraq shifted from brutal street fighting to fragile calm, only to see ISIS rise out of the same ground a few years later.

The story widens to Afghanistan's hidden record in the Afghanistan Papers, then follows Marines into humanitarian work in Liberia, Haiti, the Indian Ocean, the Philippines, and Nepal, where ships become lifelines instead of launchpads. Libya, Benghazi, and the ISIS war show how quickly combat can return.

The chapter closes on the future of the Corps, from Force Design debates to the simple ideas that have outlasted every reorganization.

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The surge years in Afghanistan sit at the center of this episode. We start in Marjah and Sangin, where canals, poppy fields, and mud walls turned into kill zones. The story follows the grinding losses of the 3rd Battalion 5th Marines and the slow shift from clearing ground to advising Afghan units. It ends at Kabul's airport in 2021, with Marines holding Abbey Gate as the war comes apart around them. From there, the chapter turns west, back to where this generation first learned to fight. The invasion of Iraq, the drive on Baghdad, An Nasiriyah's Ambush Alley, and the twin battles of Fallujah show Marines learning urban war along the Euphrates. Together, Helmand and Iraq become one story, a long arc of patrol bases, city fights, and withdrawals that never feel like closure.

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The Cold War ended, but crises kept coming. This episode opens in the Balkans, where Yugoslavia's breakup pulls Marines into a different mission. Offshore in the Adriatic, they fly strikes, launch rescues, and put infantry ashore as refugee camps, no-fly zones, and patrols blur the line between war and relief. From there, the story follows deployments to Haiti, Liberia, Sierra Leone, Albania, and East Timor, where Marines secure embassies, evacuate civilians, and support coalitions trying to hold together collapsing states.

Then 9/11 hits, and the long war begins. Task Force 58 pushes hundreds of miles inland to seize Rhino and Kandahar, proving sea-based Marines can operate inside a landlocked country. The chapter ends in Helmand, in places like Garmsir, Now Zad, and the Ganjgal Valley, where patrol bases, IEDs, and hard lessons define a war with no clean finish.

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Vietnam ended, but its shadow did not. This episode opens with Project 100,000 and the Pentagon Papers, where promises of opportunity and careful strategy give way to lowered standards, hidden escalation, and young men sent to fight under false stories.

From there, we follow the Marines into uneasy interventions. Beirut begins as a mission of presence and ends in the rubble of the 1983 barracks bombing. Grenada and Panama mix rescue, raids, and regime change on small pieces of ground where the politics are anything but simple.

The story moves into the 1990s, when Marines become first in for a new kind of mission. Desert Shield and Desert Storm show how fast they can break a fortified army, while Somalia, Liberia, Haiti, and northern Iraq put them to work feeding the hungry and guarding refugees. Again and again, Washington speaks in the language of good intentions, and Marines live with the cost.

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