Kit Up has an amusing story about Army Black Hawk pilot, and former infantryman, who decided that his M4 and M9 did not offer his enough firepower, so he swapped them for a M249 Para (with custom mods) and a M203 (with FD-203 standalone conversion).
I like this pilots style, although I can’t help feeling his personality is better suited for a AH-64 Apache with its M230 Chain Gun and Hellfire missiles.