The caption on this photo says that the children were running away from American Forces.

This is WRONG.

The aircraft that dropped the napalm was a VNAF, A1E1, Skyraider. (that's Vietnamese Airforce)
There were NO American Forces in Sth. Vietnam at the time. (apart from Embassy staff)
The photo was taken in 1975 Not 1973.

The Sth Vietnamese Forces were defending their country from an illegal invasion by Nth. Vietnam. America & the Allies had left Sth. Vietnam in 1972, After the Paris Accord. Nth. Vietnam broke that Accord & invaded Sth. Vietnam in 1975.

Please, if you are going to post make sure that you have your facts correct.