Brigade's strategy: 'Strike and destroy'

Gibbs, 25, was reassigned to the 3rd Platoon for reasons that are unclear. Army officials declined to say why he was transferred, citing the ongoing investigation.

Within days of the transfer, other soldiers have said in statements to investigators, Gibbs confided to his new platoon mates that he had gotten away with "stuff" during his previous deployments. They also said he talked about how easy it would be to stage the killings of innocent Afghans. Investigators are now examining Gibbs's involvement in the killing of an Iraqi family in 2004.

Through a spokeswoman at Fort Knox, Ky., where he now works for the U.S. Army Accessions Command, Tunnell acknowledged that Gibbs served on his security detail "for a brief time" but declined to answer other written questions for this article.

When asked in July about the killings, he told the Seattle Times that the fact that his brigade had opened the investigation by itself was "a good comment on how the system is supposed to work."

Gibbs's attorney and family also declined to comment for this article. His attorney previously told reporters that the killings Gibbs is charged with were combat-related and therefore justified.

The 5th Stryker Brigade - named for the Army's eight-wheeled Stryker combat vehicles - had trained for more than a year under the assumption that it would go to Iraq. In February 2009, however, it learned that it would go to Afghanistan instead.

That month, the brigade was undergoing mission rehearsal exercises at the National Training Center at Fort Irwin, Calif. Evaluators warned Tunnell that his disdain for counterinsurgency would cause trouble in Afghanistan, but the brigade commander ignored them, said Richard Demaree, a retired lieutenant colonel who served as a battalion commander for the 5th Stryker Brigade.

"Everybody was astonished he has this war-fighting philosophy toward Iraq or Afghanistan that was totally out of sync with the Army," Demaree said.

Counter-guerrilla strategy

Tunnell, who served in Iraq and was badly wounded there, was a devotee of counter-guerrilla strategy, which places more emphasis on raids and other aggressive tactics but had been rejected as a doctrine by the Army in the aftermath of the Iraq insurgency. According to Demaree, Tunnell barred his soldiers from using the term COIN, shorthand for "counterinsurgency."

Demaree, who says he was later forced to relinquish his battalion command because of personal conflicts with Tunnell, said many officers worried that Tunnell's contempt for counterinsurgency would interfere with their mission in Afghanistan. "I believed it would put soldiers' lives unnecessarily at risk," he said.

Tunnell's mind-set also alarmed NATO and U.S. officials shortly after the 5th Stryker Brigade arrived in Kandahar, Afghanistan, according to a State Department official who was present in Kandahar. At the time, military and civilian leaders in NATO's Regional Command South had embraced counterinsurgency.

"We all said: 'This is going to be a disaster. This is the exact opposite of what we need,' " said the official, who spoke on the condition of anonymity because agency rules forbid him from giving unauthorized interviews.

U.S., Dutch and Canadian officials asked Army Brig. Gen. John Nicholson, then the deputy commander of Regional Command South, to intervene with Tunnell. Nicholson agreed to talk to the brigade commander, but the chat had little effect, the State Department official said. Nicholson did not respond to an e-mail seeking comment.

"Tunnell was just apparently totally unimpressed by what he was told," the official said. "He spoke to us and said, 'Some of you might think I'm here to play this COIN game and just pussyfoot with the enemy. But that's not what I'm doing.' "

Against the grain

Tunnell's Strike and Destroy approach contrasted with official guidelines issued by Gen. Stanley A. McChrystal, then the top U.S. commander in Afghanistan, which read: "Protecting people is the mission. The conflict will not be won by destroying the enemy."

As the 5th Stryker Brigade began suffering heavy casualties, however, some officers and enlisted soldiers grumbled that Tunnell's strategy was backfiring. According to the Army Times, Tunnell relieved a company commander, Capt. Joel Kassulke, in November after he advocated for counterinsurgency and tacked a quote from McChrystal's guidelines on a command post wall.

On Jan. 28, members of the 3rd platoon fatally shot an unarmed Afghan man along Highway 1 in Kandahar. Some soldiers said they thought the man could have been a suicide bomber.

When Capt. Matthew Quiggle, the platoon's company commander, heard of the incident, he became "furious," according to one soldier, Cpl. Emmitt Quintal, who later gave a statement to Army investigators. The platoon had shot and killed another unarmed Afghan man two weeks earlier, so Quiggle told the soldiers "they needed to search until they found something" that would justify the shooting, according to the statement. Quiggle did not respond to a request for comment submitted through the Army.

In response, Gibbs and other members of the unit planted a magazine from a contraband AK-47 rifle next to the corpse "to give the appearance the Afghan was an insurgent," according to an Army investigator's report. The shooting was subsequently ruled justified, and no one was disciplined.

There were more warning signs. In February, the father of one member of the unit called the command center at Joint Base Lewis-McChord to report that his son had told him that Gibbs and other members of 3rd platoon had "gotten away with murder" and were planning more killings.

The father spoke to the sergeant for 12 minutes, records show, but the Army did not take action. Army officials have since confirmed the phone call and are now investigating why the warning was ignored.

Members of the platoon would kill two more unarmed Afghans, according to charging documents.

Army criminal investigators learned about the killings in May as they were scrutinizing hashish use in the 3rd Platoon. In June, they charged Gibbs and four other soldiers with murder.