On This Day in HistoryThe Wartime Organization That Brought Hollywood Stars Like Marilyn Monroe and Nancy Sinatra to the Front Lines to Entertain the TroopsEstablished on this day in 1941, the United Service Organizations offers wholesome entertainment options to off-duty service members Marilyn Monroe performs in front of service members in Korea in 1954. Public domain via Wikimedia CommonsToward the end of World War I, American military leaders realized that they had a morale problem.Flooded with reports that troops were filling any free time they had with excessive alcohol consumption and sexual escapades that resulted in sexually transmitted infections, Army commanders expressed concerns about their soldiers fitness for battle. Private organizations like the Salvation Army and the American Red Cross stepped up to provide support, offering wholesome entertainment options to keep off-duty soldiers busy and maintain morale.Nearly two decades later, with the United States on the brink of entering World War II, President Franklin D. Roosevelt requested that these private organizations form a more permanent answer to the militarys needs. Incorporated in New York on February 4, 1941, the United Service Organizations (USO) centralized morale efforts by the Young Mens Christian Association, the Young Womens Christian Association, the National Catholic Community Service, the National Jewish Welfare Board, the National Travelers Aid Association and the Salvation Army.Why USO Tours Were Vital for Troop Morale in the PacificWatch on The USO created recreational centers for troops to come together and relax. These centers served coffee and doughnuts, brought thoroughly vetted young women in to socialize with service members, and hosted activities like letter-writing.At the heart of the USO was the idea that entertainment, all phases of itradio, pictures and liveshould be treated as essential, Billboard magazine reported in 1943. In addition to screening movies, the USO decided to bring Hollywood to the front lines, coordinating tours by some of the countrys most popular performers. The Army flew comedians, musicians and dancers in from the U.S. to perform for troops around the world, starting just months after the USO was incorporated.Comedian Bob Hope kicked off 50 years of touring with the USO in May 1941, while movie star Edward G. Robinson traveled to France to meet with troops in 1944. In between these shows, troops stationed in the Caribbean enjoyed performances by singer Jane Pickens, dancer Ray Bolger, and comedians Laurel and Hardy. Bob Hope (center, in suit) sits with American service members in Korea in 1950. Public domain via Wikimedia CommonsTours continued after World War II. One of the USOs most iconic acts saw Marilyn Monroe travel to Korea in 1954. She performed for roughly 100,000 service members over just four days. During the Vietnam War, Nancy Sinatra sang in front of troops and visited injured service members.The USO remains active today, living out the same ideals. The organizations centers on the front lines provide refreshments and internet access to troops, and its staff send holiday care packages to those stationed far from family and friends. The USO also hosts virtual and on-site performances. From the Dallas Cowboys Cheerleaders to Katy Perry to Stephen Colbert, celebrities are still volunteering to boost troops morale.Get the latest stories in your inbox every weekday.