How American engineers developed “floating airfields” to surprise Japanese garrisons

November 20th, 1943, Tarawa, Gilbert Islands. The sun barely rises over the jagged coral reefs as Private First Class Robert Sherid clings to a seawall, water sloshing around his chest, crimson streaks floating around him. Machine gunfire rakes the beach, screaming through the air and into flesh. Behind him, landing craft sit stranded, helpless, while his fellow Marines are cut down in a nightmare that seems endless. They had come to claim this tiny strip of coral, barely two miles long, but the cost was almost unimaginable. Less than thirty percent of the first wave would survive.

Above the chaos, Marine Corsairs dive and bank, circling like predators—but not for their friends. They belong to fleet carriers stationed miles away, far out of range. By the time the planes reach the battlefield, their fuel dwindles to almost nothing, giving them barely twenty minutes to strafe, to bomb, to protect the men drowning in fire and water. Air support windows stretch agonizingly long, leaving soldiers pinned, bleeding, dying. The numbers are brutal, indisputable: nearly one thousand Marines will perish on this day.

The tragedy of Tarawa might have been avoided, though, if not for an idea born 1,400 miles away—an idea so audacious, so reckless, that seasoned naval officers dismissed it outright. They called it “the Woolworth carriers,” cheap, disposable floating airfields that, by every measure of naval engineering, shouldn’t exist. And yet, these were about to change the course of the war in the Pacific—and the fate of tens of thousands of American lives.

The story begins not with a sailor or a naval architect, but with Henry J. Kaiser, a 60-year-old industrialist who had never designed a warship in his life. Born in 1882 to German immigrants in upstate New York, Kaiser quit school at thirteen and went on to become a master builder of infrastructure. Hoover Dam? Finished two years early. San Francisco-Oakland Bay Bridge? Delivered ahead of schedule. His reputation was simple: impossible deadlines didn’t exist; obstacles were meant to be ignored.

In 1941, with war looming and Britain’s merchant fleet decimated by German U-boats, Kaiser built a shipyard from nothing in Richmond, California—in ninety days. With no prior shipbuilding experience, he promised to deliver ships faster than they were being sunk. Skeptics balked. The government, desperate, gave him a small contract, and he stunned the world: a cargo ship in 110 days, nearly half the industry standard. He welded instead of riveted, prefabricated sections off-site, and employed women and minorities that traditional yards refused to train. The ships weren’t glamorous; they weren’t battleships. But they floated, and they floated fast.

Kaiser’s epiphany came one night while touring a naval shipyard. He watched a fleet carrier, USS Essex, under construction. The keel had been laid months ago, and it would take twenty months to finish. He did the math. At this rate, America would lose the Pacific War before it could build enough carriers. He turned to his chief engineer, Klay Bedford, and asked the impossible: “How fast could we build an aircraft carrier?” Bedford, incredulous, sketched a plan. Stripped to a merchant hull, add a flight deck, six months. Kaiser’s eyes lit up. “Fifty?” he asked. Bedford laughed. “Insane.”

But Kaiser didn’t care about insane. He cared about lives. At a January 1942 meeting with the Navy, he laid out his vision: convert fifty merchant ships into escort carriers, all simultaneously, all delivered at the rate of one per week. The Navy exploded. Captain Edward Cochran sputtered. “We took eight months to convert one ship. You want fifty in fifty weeks?” “Yes,” Kaiser said. “Impossible?” “Don’t ask.” The admiral’s objections flew: lack of armor, inadequate guns, inexperienced crews, untested flight decks. Kaiser smiled. “I deliver what I promise when I promise it.”

The Navy refused at first. But President Franklin Roosevelt, staring at a grim reality of Japanese dominance in the Pacific, insisted. America didn’t need perfect carriers. They needed carriers now. By April 1943, USS Casablanca slid into the Columbia River, the first of fifty. From keel to launch: 108 days. Sea trials followed. Fighter planes took off and landed flawlessly. Against every prediction, the “Woolworth carrier” floated, it flew, it worked.

By the summer of 1943, one escort carrier launched every week. They were cheap, they were crude, and they were about to prove their worth in blood and fire. When American forces landed on the Gilberts, Marines finally had continuous air support just five miles offshore. Robert Sherid, the same soldier pinned to the seawall at Tarawa, watched Wildcats and Avengers strafe Japanese positions every ten minutes. The difference was immediate. Casualties dropped dramatically. Ground troops weren’t abandoned between fuel-limited sorties. They had a shield in the sky, their own private air force.

Yet the dangers remained. On November 24th, 1943, USS Liscomb Bay, one of these “cheap” carriers, was struck by a torpedo fired by Japanese submarine I-175. The magazine exploded. In 23 minutes, 644 sailors died. The critics had been right: these ships were vulnerable. But the program did not falter. By 1944, escort carriers led assaults in Palau, the Philippines, and beyond, providing unprecedented air support that cut Marine casualties by thirty to forty percent.

Their ultimate test came at the Battle off Samar. Six escort carriers, part of Taffy 3, faced four Japanese battleships, including the mighty Yamato. The enemy expected easy victories. What they got was chaos. Aircraft launched from these small decks attacked relentlessly, sometimes out of ammunition, sometimes using nothing but propellers and sheer courage to disrupt Japanese gunners. Two escort carriers, USS Gambier Bay and USS St. Lo, were sunk, but their sacrifice delayed the Japanese long enough to protect the landing forces. Over eight hundred Japanese sailors would ultimately retreat, leaving the American invasion intact.

By the war’s end, Kaiser’s carriers had participated in every major amphibious operation in the Pacific, providing air cover for over 200 landings. The Marines estimate tens of thousands of lives saved because of these “disposable” ships. Kaiser never sought the spotlight. When awarded the Navy Distinguished Service Medal, he deferred praise to the workers, the engineers, the crews who operated ships that the world mocked.

In Tokyo Bay, September 2nd, 1945, during Japan’s surrender, thirteen escort carriers stood among the assembled fleet. They were crude, small, and cheap—but they were heroes in steel. For the Marines, the sailors, the men and women who survived Tarawa, Peleliu, and Leyte, these carriers were proof that sometimes the fastest, cheapest, most audacious solution is the one that saves lives.

Robert Sherid would write in his memoir years later, “We called them Jeep carriers. We called them Woolworth carriers. We mocked them because they were cheap and crude. But when bullets were tearing through our ranks, they were there every time. They saved my life. They saved the lives of thousands who never even knew their names.”

Sometimes, winning a war isn’t about perfection. It’s about courage, speed, and refusing to accept the impossible. Sometimes, the craziest ideas, built by the least likely people, change the world—and bring soldiers home alive.