Morale Patches, or simply patches. These are informal patches that became popular during the military campaigns in Iraq and Afghanistan among the American military. Unlike insignia and military chevrons, patches do not carry any official information, but only indicate the owner's sense of humor.
"Apocalypse Now" is one of the best films about Vietnam, and one of the greatest films ever made, because it goes further than any other into the dark corners of the human soul. It's not so much about war as it is about how war brings out truths about people that they would never have known.