that 320 incidents had a factual basis. The substantiated cases included 7 massacres between 1967 and 1971 in which at least 137 civilians were killed; seventy eight further attacks targeting non-combatants resulting in at least 57 deaths, 56 wounded and 15 sexually assaulted; and 141 cases of U.S. soldiers torturing civilian detainees or prisoners of war with fists, sticks, bats, water or electric shock. Journalism in the ensuing years has documented other overlooked and uninvestigated war crimes involving every army division that was active in Vietnam, including the atrocities committed by Tiger Force. Rummel estimated that American forces committed around 5,500 democidal killings between 1960 and 1972, from a range of between 4,000 and 10,000 killed. U.S. forces established numerous free-fire zones as a tactic to prevent Viet Cong fighters from sheltering in South Vietnamese villages. Such practice, which involved the assumption that any individual appearing in the designated zones was an enemy combatant that could be freely targeted by weapons, is regarded by journalist Lewis M. Simons as "a severe violation of the laws of war". Nick Turse, in his 2013 book, Kill Anything that Moves, argues that a relentless drive toward higher body counts, a widespread use of free-fire zones, rules of engagement where civilians who ran from soldiers or helicopters could be viewed as Viet Cong and a widespread disdain for Vietnamese civilians led to massive civilian casualties and endemic war crimes inflicted by U.S. troops. One example cited by Turse is Operation Speedy Express, an operation by the 9th Infantry Division, which was described by John Paul Vann as, in effect, "many Mỹ Lais". A report by Newsweek magazine suggested that at least 5,000 civilians may have been killed during six months of the operation, and there were approximately 748 recovered weapons and an official US military body count of 10,889 enemy combatants killed. R.J. Rummel estimated that 39,000 were killed by South Vietnam during the Diem-era in democide from a range of between 16,000 and 167,000 people; for 1964 to 1975, Rummel estimated 50,000 people were killed in democide, from a range of between 42,000 and 128,000. Thus, the total for 1954 to 1975 is 81,000, from a range of between 57,000 and 284,000 deaths caused by South Vietnam. Benjamin Valentino estimates 110,000–310,000 deaths as a "possible case" of "counter-guerrilla mass killings" by U.S. and South Vietnamese forces during the war. The Phoenix Program, coordinated