News reels were shown at movie theaters and were replaced with a new one, each week. They were shown before the feature presentation and included in the price of admission to see a movie. There were several companies that made news reels. Willow Run is in the suburbs of Detroit. There were only two movie theaters in that town in 1944. If you lived in Detroit or had a reliable way of getting to that big city in a time of tight gasoline rationing, you would have access to many more movie houses and could see four or more different news reels every week. However, most people in 1944 would only go to their local movie theater. One that was within walking distance to their home. Thus, the vast majority of Americans in 1944 would only see one news reel per week. Movie theaters back then and well into the 1950s would show a cartoon, a short comedy movie like the Three Stooges, then a news reel, before showing the feature presentation.
Source: Jenny Nolan "Willow Run and the Arsenal of Democracy" mentions two movie theaters in that town during WWII. Many elderly people have told me about how different the movie going experience was in the days before television. They did not show movie trailers or commercials before the movie started, like they do today.