Monroe sang the national anthem for Opening Day at Yankee Stadium annually from 1945 through 1960 and also at World Series games hosted at Yankee Stadium during that time. She performed the national anthem in 1949 for the unveiling of a monument to Babe Ruth in Monument Park. She also continued traveling to Europe and North Africa on USO tours, and went to Korea in 1953. The family of Ed Barrow, former president of the Yankees, invited her to sing "Abide with Me" at his funeral in 1953. She also sang the national anthem at the ceremony preceding the start of the demolition of Ebbets Field on February 23, 1960.
