Frank Merrill

Merrill was appointed commander of the 5307th Composite Unit, known as Merrill's Marauders. The unit was a long-range penetration force trained for jungle warfare in Burma, operating behind Japanese lines.

Merrill led the Marauders in a 100-mile march through jungle to capture the Myitkyina airfield. The operation succeeded in securing the airfield, but the subsequent siege of Myitkyina lasted 78 days and resulted in heavy casualties.

Merrill's Marauders fought the Battle of Walawbum, a successful engagement against Japanese forces in northern Burma. The battle demonstrated the effectiveness of long-range penetration tactics in jungle warfare.

Merrill was evacuated from Burma due to a heart attack and malaria during the Myitkyina campaign. His health deteriorated from the harsh jungle conditions, and he was replaced as commander of the Marauders.