Movies and the radio were the primary things. Card games of all sorts and some sports. TV hadn't been invented and neither had computers.
There was no entertainemnt in world war 2 they sat about doing nothing
They played on their Ps3
crosswords and board games
On the Allied side it was the USO.
hide and don't get hit by a bomb
the most common form of entertainment is kissing.
boxing was popular in world war 2. mostly on battle ships such as HMS hood for entertainment
mostly movies
By making newsreels and Propaganda.
television
By sending entertainers to the troops
no