Throughout their 51-day Texas standoff in the spring of 1993, Koresh and his followers repeatedly compared their plight to that of God's people facing the "flaming chariots" of Babylon in the biblical prophesies of Nahum and Habakkuk. A follower says Koresh believed he would be the one to "bring down Babylon" by sacrificing himself and his denomination.

Will it turn out that -- like an earlier group of Texas martyrs who died buying time for Sam Houston at the Alamo -- the Branch Davidians still retain the power to reach out from the grave and smight their oppressors?

After completing the documentary "Waco: The Rules of Engagement' -- nominated for an Academy Award -- researcher Mike McNulty continued to delve into the central mystery of Waco: Why would scores of perfectly sane and decent Christian Americans apparently choose to condemn themselves and their "unusually bright and well-treated" children (per Texas child welfare authorities) to death in the flames, rather than coming out and surrendering to the federal tanks and helicopters that surrounded them?

Mr. McNulty appears to have found some answers -- at least to the extent anyone still can, given the determined after-the-fact efforts to bleach and bulldoze the "crime scene." Those answers are offered in the new video: "Waco: A New Revelation," directed by Jason Van Vleet.

The documentary is not strident. If anything, the new evidence is piled up in such a measured and matter-of-fact way -- superposed with the sneering denials of FBI spokesmen and apologists like U.S. Rep. (now Sen.) Charles Schumer -- that its full impact may not register without a second viewing.

But at that point, any thoughtful viewer of conscience must wonder how willfully the Congress and populace of this country must want to ignore the truth, to be able to close their eyes to facts like the following:

On the evening of Feb. 28, three Branch Davidians who had not been present for the initial BATF raid and shoot-out attempted to get home to their wives and children in the Mount Carmel church. They were intercepted and fired upon by 17 agents "dressed as trees." Two were captured, but Michael Dean Schroeder -- not charged with any crime -- was shot seven times and killed. As the other two Davidians were led away -- after Schroeder was down -- they report hearing two final shots behind them, in quick succession. An autopsy showed Michael Dean Schroeder had two neat bullet holes immediately behind his right ear. His body was left lying in the ravine for five days.

Far from inviting an exodus and surrender, tape recordings reveal that by late March, FBI negotiators told the Davidians: "No one is authorized to come out of there for any reason. The patience of the bosses is no longer what it was. If anyone tries to come out, they will be treated in such a way that they'll be forced to retreat."

Former FBI Director William Sessions wanted to fly to Waco to negotiate with David Koresh face-to-face, but the Justice Department refused to let him board his plane. Sessions' wife, Alice Sessions, explains: "The FBI did not want it negotiated. They wanted to show they could win with military type tactics; it was a paramilitary organization."

When the final government attack with toxic and disabling CS gas finally began early on the morning of April 19, the buried school bus was gassed first, forcing the women and children to retreat to the reinforced concrete records vault, which the FBI referred to as "the bunker." Gas was then pumped into the bunker, which had no ventilation, for two hours. Rep. John Mica, R-Fla., tells Congress: "At the very least that resulted in the babies and children being tortured for at least three to four hours."

Manning sniper post Sierra 1 in the "undercover house," Lon Horiuchi (who eight months earlier had shot the unarmed Vicky Weaver as she stood holding a baby in her kitchen in Ruby Ridge, Idaho), "accompanied by most of the FBI team from Ruby Ridge," swore he did not fire into the church on April 19. But other FBI agents swore they heard fire from his position, and four expended .308 shell casings were later found there.

At 9:02 a.m. On April 19, a Branch Davidian is spotted trying to exit the building across the roof. "Falcon 2," an FBI helicopter, is seen approaching in ground-level footage. It hovers, and muzzle flashes can be seen from its port waist gun. Dr. Edward Allard, formerly of the U.S. government's Night Vision Directorate, says his analysis shows at least three, five-shot machine gun bursts. "It's indicative of a machine gun firing 600 rounds per minute," he says. "It's impossible for these to be solar flashes."

Other close-range video -- not high-altitude footage -- clearly shows full-sized machine guns in cradle mounts in the waist doors of the FBI helicopters, which the government long swore were unarmed.

Branch Davidians Phillip Henry and Jimmy Riddle appear to have been shot behind the building at this time. Neither had soot in their lungs or carbon monoxide in their blood -- both died before the fire. An autopsy showed half of Riddle's body torn away, which the medical examiner said could have been consistent with "an encounter with a tank tread."

However, when the family re-opened Riddle's casket for a follow-up examination of his fatal bullet wounds, the evidentiary portion of his skull was missing. The widow says the local medical examiner was instructed by Texas authorities and U.S. marshals not to release his autopsy results to the family.

The film's researcher, Mike McNulty, tells me the most likely scenario is that Henry and Riddle were shot behind the building by government agents around 9 a.m. A lull followed, as the FBI pondered what to do. Them, closer to noontime, their bodies were bulldozed back into the church dining room by tanks, and the final government assault -- with machine guns and incendiary grenades -- began in earnest.

Viewing the government's high-altitude infrared footage of the final battle, Dr. Edward Allard, formerly of the U.S. government's Night Vision Directorate, explains: "What we have here is a tank-infantry type of operation. As the tank advances, two men have dropped out of the escape hatch. They then roll over, and as they roll over they open up with automatic gunfire. The shots occur at one-thirtieth of a second. There is absolutely nothing in nature that can cause thermal flashes to occur in a thirtieth of a second."

Dr. Allard reports he stopped counting the gunshots into the dining room -- the last available escape route from the building after the fire broke out -- "after 62 individual shots."

The filmmakers report Maurice Cox, a former analyst with the U.S. intelligence community, determined that for an aircraft circling at 9,000 feet to pick up rhythmic flashes at a rate of 600 per minute from "reflected sunlight" as the government claims, the reflective surfaces would have to be placed in a precise array, and the aircraft would have to be traveling at the absurd speed of Mach 1.8.

FBI officials have refused to respond to Cox's findings, and have dragged their feet in the face of demands that they re-create the footage to see if sunlight reflections can be made to look like the flashes in the Forward-Looking Infrared (FLIR) footage. Absurdly, the FBI claims cameras like the one used in 1993 can no longer be obtained.

Meantime, ground level footage -- not distant aerial shots -- clearly show men in Kevlar army helmets firing projectiles from an M-79 grenade launcher into the church's storm shelter the morning of the final assault. Seconds later, white smoke pours from the shelter.

Although the government has consistently denied the Army's Combat Applications Force -- the "Delta Force" -- was present at Waco, previously classified Army documents reveal that four Delta Force "observers" were deployed to Waco on March 21. Gene Cullen, a senior case officer with the CIA's Special Forces Group, reports on camera he was "initially told they would just be observers. But at (an April 14) CIA briefing, we were told there were more than 10, and that they would be actively participating" in the April 19 attack.

March Bell, who headed the staff of the last congressional investigation into Waco, tells the filmmakers: "They were in the tanks and the sniper posts. They were not giving advice back in some conference room -- they were working shoulder to shoulder with the (FBI's) Hostage Rescue Team."

Rep. Stephen Buyer, R-Ind., explains that it is a federal crime -- a violation of the Posse Comitatus Act -- to use any part of the Army or Air Force "to enforce the law in this country."

But CIA agent Cullen says he met Delta Force operators in Europe who "told me not only were they forward deployed at Waco, Texas, but they were actually involved in a gunfight with the Branch Davidians."

Steven Barry, a retired Special Forces sergeant, concurs: "I did talk to some Combat Applications Group guys, and they did confirm that, yes, portions of B Squadron were there pulling triggers."

Most chilling of all, Sgt. Barry reports: "Their operators had penetrated the building on several occasions, and on one occasion, late April 17 or early on the 18th, they saw Koresh within six feet of them. They radioed back to the Tactical Operations Center for permission to grab him, and within minutes the word came back from the Justice Department, 'No, we already have a plan in place,' that being what happened on April 19."

"People ask why we didn't let the children out," sobs Davidian survivor Clive Doyle. "If they saw all that was happening, and they were there with their children, would they have sent them out to the animals outside that were shooting at them and doing all those terrible things? No. ... When there was shooting going on it's kind of tongue in cheek to then turn and say, 'Well, why didn't you come out?' "

Although the government long denied its agents fired any incendiary projectiles into the church -- which was lined with hay bales against government gunfire, heated with kerosene heaters after the government shut off the electricity, and then flooded with combustible propellant for the CS gas -- photographs taken after the fire clearly show a U.S. military Mark 651 pyrotechnic CS gas projectile lying in the ashes.

When researcher McNulty finally broached the evidence room with the aid of the Freedom of Information Act in 1998, the pyrotechnic devices visible in those photographs were missing from the evidence boxes. But two additional pyrotechnic 40mm devices were found. The film's investigators also found -- mislabeled as gun parts or silencers -- six spent government flash-bang grenades, which were recovered from the dining room, the chapel, and the southwest corner of the building -- "all three points of origin of the fire."

Asked at a press conference whether she is embarrassed that independent filmmakers could find this evidence, when the FBI had been unable to turn it up in six years, Attorney General Janet Reno responds: "I'm not embarrassed. I'm very, very upset."

At 12:10 p.m. on April 19 the overhead FLIR footage shows at least two automatic weapons being fired into the rear of the dining room, the only remaining undamaged exit from the now-burning building. According to a Justice Department report, at least 15 people were found shot to death at this location. The FBI conducted ballistic tests which the DOJ later termed "inconclusive and rudimentary at best."

"I cannot remember anything more sickening" than watching that gunfire into the building's last exit, comments Dr. Allard.

Asked whether the Davidian gunshot victims appeared to have committed suicide, a former FBI forensic crime scene analyst who preferred to be filmed only in silhouette responds: "The majority of people, the bodies that I saw, were clear-cut homicide victims. ...I don't know who fired the bullets into their bodies. So in fact what we have here is an open homicide."

Congressional investigator March Bell says the treatment of those bodies was "very troubling. The bodies were preserved in a semi-frozen state in two trailers for the purposes of investigation. For some reason those trailers under the control of the FBI were allowed to not have any electricity running to them and the bodies deteriorated beyond the point where any sort of forensic evidence could be gathered. We were very disturbed by that."

Indeed, the scene of the massacre was declared a "bio-hazard," and since the FBI had predetermined this was a mass suicide, "The FBI investigators were instructed to sift, wash, and bleach the evidence associated with the bodies, destroying much of its evidentiary value."

The large hole in the roof of the concrete records vault where the women and children were sheltering -- the rebar bent downwards as though from an external blast -- has never been explained. Military explosives expert Brig. Gen. Benton Partin, USAF retired, says "What it tells me is that you had a demolition charge that went off on the roof."

The FBI bulldozed the "bunker" to rubble. Six years later, in 1999, when Davidian attorneys were granted permission to recover the portion that might bear traces of the explosive used, that portion of the bunker ceiling was found to be missing. Gen. Partin concludes the rudimentary gunpowder possessed by the Branch Davidians would not have been capable of blowing that hole through six inches of reinforced concrete. Special Forces Sgt. Steven Barry reports the damage inside the records vault was "consistent with a shaped charge," as does retired USAF ordnance engineer Col. Jack Frost.

"In military operations, it's standard procedure to do this," Barry explains, in order to reduce casualties among the attacking forces.

The FBI's White House contact during the Waco operation was presidential aide Vince Foster, who committed suicide 90 days later. His widow told the FBI that the Waco tragedy was "very high on his list of concerns." She says he told the FBI he "believed everything was his fault," though Foster also commented: "The FBI lied to me."

After his suicide, the White House kept the Department of Justice and the Parks Police from reviewing Foster's files. Witnesses saw Maggie Williams -- Hillary Clinton's chief of staff -- removing Waco files from Foster's office. The staff was told "The contents of the box needed to be reviewed by the First Lady."

Sgt. Barry of the Special Forces: "If the Special Combat Applications Group were on the ground that day actually pulling triggers, the origin of that operation would have come from the White House. It would have come from the president. Because the Special Combat Applications Group is, for all intents and purposes, the president's private army."

So: The ATF, the FBI, and the Army Combat Applications Group (the "Delta Force" -- which can only have been dispatched to the scene by the special authorization of William Jefferson Clinton) stand accused of murder at Waco.

Why are there still no trials?