According to historian Paul Holsinger, between 1941 and 1945, the USO did 293,738 performances in 208,178 separate visits. Estimates were that more than 161 million servicemen and women, in the U.S. and abroad, were entertained. The USO also did shows in military hospitals, eventually entertaining more than 3 million wounded soldiers and sailors in 192 different hospitals. There were 702 different USO troupes that toured the world, some spending up to six months per tour. In 1943, a United States Liberty ship named the SS "U.S.O." was launched. She was scrapped in 1967.