During WW2 in the US there was such a thing as VMAIL which stood for Victory Mail. It was patriotic and it’s purpose was to unite the country in supporting the various arms of the military. Postcards were common for personal correspodence and on occasion a whole portfolio could be sent. The pics below are from a portfolio that was never sent. I forget where I got it but most likely it was a second hand store that dabbled in antiques. This was before color postcards were common and so a colorizing technique was used. This portfolio shows US forces from all branches of the US military c.1942 judging from the uniforms and equipment shown. The captions give a bit more detail.