I would say that the men in uniform and the plane dropping the bomb , combined with the significance of Valentine's day and smoke signals confirm that it's SOMETHING to do with friendly fire, but I've yet to fully understand these cartoons.
This is not a particularly bad one. Most days I scratch my head at their significance and I have not once found them funny !
I think they're a waste of space, and I'd personally rather see another sudoku, or a few more quiz questions !