This meme supposes that big guns are better. The image shows army but the rules apply more to a gangster armed fight rather than a war. Thus, bringing .44 magnum to a street fight values more than having glock 17. In a real military conflict being able to carry and shoot a lot of rounds is more important than being able to one shot a bear with your handgun. Thus, .45 ACP can be categorized as a hunting caliber now.
Small nitpic, most police forces and militaries would argue 9mm is more than enough (and it costs about half as much per round).
This meme supposes that big guns are better. The image shows army but the rules apply more to a gangster armed fight rather than a war. Thus, bringing .44 magnum to a street fight values more than having glock 17. In a real military conflict being able to carry and shoot a lot of rounds is more important than being able to one shot a bear with your handgun. Thus, .45 ACP can be categorized as a hunting caliber now.