Since 1943 the US flamethowers used napalm as fuel.
True, but technically after WWII and Korea, even Napalm used in ordnance wasn't the same ingredients: powdered aluminum soap of naphthalene with palmitate, also known as napthenic and palmitic acids. Modern day napalm uses no Napalm (naphthalene or palmitate) -- instead using a mixture of polystyrene, gasoline and benzene. After the Korean War a safer but equally effective napalm compound was developed. This new formulation is known as "napalm-B", super-napalm, or NP2, and it uses no napalm. Instead, polystyrene and benzene are used as a solvent to solidify the gasoline.
Chadwbaker also found this on your link - "The M9A1-7 and other flamethrowers have been replaced by the M202A1 Incendiary Rocket launcher" (No particular date given). So it appears the flame thrower is now regulated to the history books. Thermobaric weapons are more effective in killing enemies in caves.
That picture of the running child all burned up was one of the most powerful pictures to come out of the Vietnam war.
Yes absolutely, but on a brighter note I saw a follow up story (back in the late 80's or early 90's)on that girl, she was living in the US and had seemed to be doing well from what I can remember. She was in her late twenty's when I saw the story and she looked beautiful. It doesn't make up for her pain, but it's a start.