During WWII, various artists from the different cartoon units (such as Looney Tunes, Disney and Walter Lanz) all gave their time to the war effort by working on training films (among other things) meant only to be shown to the soldiers. Because of this, the cartoons were not in color but DID have some colorful content...such as swearing and sex jokes! I can only assume that folks thought that if the young men were old enough to die or kill, they were more than old enough for some bawdy humor.
"Rumors" is one of the more effective installments of Private Snafu. It's all about how stupid rumors morph and do much damage to morale. And, it's all begun with our favorite idiot, Private Snafu, listens to an unfounded rumor and begins passing it through camp. Very well made and enjoyable even today....more than 70 years later.