how many fragging incidents vietnam
The tally of 730 fragging incidents comes from Guenter Lewy's 1978 book, America in Vietnam, which cites 1971 army testimony before Congress: 126 incidents in 1969, 271 in 1970, and 333 in 1971 (presumably as of the date of testimony). It's unlikely fragging suddenly ceased in 1972, so 730 is probably low.