It appears that napalm is a touchy subject and figures seem to be unavailable; except for possibly some extremely deep research on the part of the historian.
250,000
The U.S. military has estimated that between 200,000 and 250,000 South Vietnamese soldiers died in the war.
The only deaths that I'm aware of were the shooting at Kent State University. I think that was 3 or 4.
South Vietnam had about 1 million men under arms at any one given time.
Texas sacrificed 3,415 men to the cause.
The Killing Fields in Cambodia
How Eating Grubs Adds to Vietnam Trip Experience
Learn About the Changes of the City Life in Hanoi, Vietnam
How to Solve Problems With Rivers