This photo of Betty Grable from 1943 was the most popular pin up photo for American GIs during WWII. You can see the other WWII pin ups here
Source and copyright: This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed.
I’ve always thought this was a fun and cheeky image, and I bet the troops loved it
absolutely!