Three Merrill’s Marauders, 1944 survivors of the secret mission of almost 3,000 presidential volunteers who fought through the disease-ridden “forgotten theater” of World War II, the China-Burma-India Theater, have lived to the age of 101. Another made it to 100.

Living to be a centenarian is remarkable. What is even more remarkable is that those Infantry jungle fighters, who have been called everything from “misfits” to “magnificent,” weren’t even expected to survive.

“We were expendable,” said Merrill’s Marauder Sam V. Wilson, who turns 93 next month. The retired Army lieutenant-general, who helped start Delta Force and still contributes to military publications, explained, “A plan existed on paper to get us into Burma, but no plan existed to get us out.”

Yet those extraordinary volunteers achieved their final objective on May 17, 1944, of capturing north Burma’s only all-weather Myitkyina airstrip by defeating the much larger elite 18th Japanese Imperial Guards Division in five major battles and 30 minor engagements.

Wilson said that when the remaining elements of the unit were disbanded on Aug. 10, 1944, in Burma, slightly more than 100 of the original Marauders remained.

Winston Churchill, British prime minister at the time, described Burma as “the most forbidding fighting country imaginable.” Gen. George C. Marshall, then Army chief of staff, said the Burma mission “was one of the most difficult of the war.” Marshall also said that mission against “large numbers of the enemy with few resources was unmatched in any theater.”

“It was hard to keep going as we wore down, became debilitated and our numbers began to decrease,” said Wilson recently from his home in Rice, Virginia. “These Soldiers, (who did) not even expected to survive, did survive by forcing themselves to take the next step. They were Infantrymen. They leaned forward and took one more step and then another. Taking that next step is what kept the outfit together to the bitter end.”

Those steps turned into an almost 1,000-mile, history-making march through the enemy-held Himalayan foothills into the jungles of Burma. With only what they could carry on their backs or pack on mules, the Marauders walked farther than any other WW II fighting force. They were the first American ground troops to fight the Japanese in Asia.