Army psychiatrist Major Nidal Hasan is suspected of a deadly rampage at the Fort Hood base in Texas.
Army psychiatrist Major Nidal Hasan
Nov. 5: Daniel Clark comforts his wife Rachel Clark at the main gate in Fort Hood, Texas, after mass shootings there killed 13.
Maj. Nidal Malik Hasan, the suspected Fort Hood shooter in the worst mass killing on a U.S. military base
Nov. 6: Federal agents search the apartment of Maj. Nidal Malik Hasan in Killeen, Texas.
A map showing the location of a mass shooting at Ft. Hood Army post in Killeen, Texas.
Nov. 5: Soldiers gather outside the gate at Fort Hood after learning of the attack.
The Army psychiatrist suspected of killing 13 people at Fort Hood reportedly warned senior Army physicians in 2007 that the military should allow Muslim soldiers to be released as conscientious objectors instead of fighting in wars to avoid "adverse events."
According to The Washington Post, Major Nidal Malik Hasan was supposed to make a presentation on a medical topic during his senior year as a psychiatric resident at Walter Reed Medical Center.
Instead, Hasan lectured his supervisors and two dozen mental health staff members on Islam, homicide bombings and threats the military could encounter from Muslims conflicted about fighting against other Muslims in Iraq and Afghanistan.
A source who attended the presentation told the paper, "It was really strange. The senior doctors looked really upset."
The Powerpoint, entitled, "The Koranic World View As It Relates to Muslims in the U.S. Military," consisted of 50 slides, according to a copy obtained by the Post.
"It's getting harder and harder for Muslims in the service to morally justify being in a military that seems constantly engaged against fellow Muslims," Hasan said in the presentation.
Under a slide titled "Comments," he wrote: "If Muslim groups can convince Muslims that they are fighting for God against injustices of the 'infidels'; ie: enemies of Islam, then Muslims can become a potent adversary ie: suicide bombing, etc." [sic]
The last bullet point on that page reads simply: "We love death more then [sic] you love life!"
On the final slide, labeled "Recommendation," Hasan wrote: "Department of Defense should allow Muslims [sic] Soldiers the option of being released as 'Conscientious objectors' to increase troop morale and decrease adverse events."
An Army spokesman told the Post Monday night he was unaware of the presentation, and a Walter Reed spokesman declined comment.
A classmate of Hasan, meanwhile, told FoxNews.com that the warning signs were all there — the justification of homicide bombings; spewing anti-American hatred; efforts to reach out to Al Qaeda — but that the military treated Hasan with kid gloves, even after giving him a poor performance review.
And though he was on the radar screen of at least one U.S. intelligence agency, no action was taken that might have prevented the Army psychiatrist from allegedly gunning down 13 people and wounding 29 others in the Fort Hood massacre last week.
"There were definitely clear indications that Hasan's loyalties were not with America," Lt. Col. Val Finnell, Hasan's classmate at the Uniformed Services University of the Health Sciences in Bethesda, Md. He and Hasan were students in the school's public health master's degree program from 2007-2008.
"The issue here is that there's a political correctness climate in the military. They don't want to say anything because it would be considered questioning somebody's religious belief, or they're afraid of an equal opportunity lawsuit.
"I want to be clear that this wasn't about anyone questioning his religious views. It is different when you are a civilian than when you are a military officer," said Finnell, who is a physician at the Los Angeles Air Force Base.
"When you are in the military and you start making comments that are seditious, when you say you believe something other than your oath of office — someone needed to say why is this guy saying this stuff.
"He was a lightning rod. He made his views known and he was very vocal, he had extremely radical jihadist views," Finnell said. "When you're a military officer you take an oath to defend against all enemies foreign and domestic.
"They should've confronted him — our professors, officers — but they were too concerned about being politically correct."
Finnell said the warning signs were clear to many, not just classmates. Faculty members, including many high-ranking military officers, witnessed firsthand his anti-Americanism, he said.
Finnell recalled Hasan telling his classmates and professors, "I'm a Muslim first and I hold the Shariah, the Islamic Law, before the United States Constitution."
He recalled one time when his classmates were giving presentations in an environmental health class on topics like soil and water contamination and the effects of mold. When it was Hasan's turn, he said, he got up in front of the class and began to speak about his chosen topic, "Is the War on Terror a war on Islam?"
Finnell says he raised his hand. "I asked the professor, "What does this topic have to do with environmental health?"
"When he was challenged on his views, Hasan became visibly upset. He became sweaty, he was emotional."
But despite questioning from the other students, Finnell said, the professor allowed Hasan to continue. He said Hasan's anti-American vitriol continued for two years as he worked toward his degree in public health.
There were even more warning signs that might have alerted the Army in recent months:
— In the days and weeks before the shooting, Hasan voiced his objections to Muslims fighting the war on terror to members of his mosque, the Islamic Community of Greater Killeen. Congregants at the mosque said he voiced his objections to Muslims serving in the U.S. military and to his impending deployment to Afghanistan.
— Over the summer, Hasan's comments led Osman Danquah, co-founder of the mosque, to recommend that it deny Hasan's request to become a lay Muslim leader at Fort Hood, the Associated Press reported.
— In the months before Thursday's shooting Hasan tried reaching out to people associated with Al Qaeda — and did so under the watchful eye of at least one U.S. intelligence agency. An intelligence official told FOXNews.com that "Hasan was on our radar for months."
On Sunday Sen. Joe Lieberman announced his intention to lead a congressional investigation into the Fort Hood murders, saying there were "strong warning signs" that Hasan was an "Islamic extremist."
"The U.S. Army has to have zero tolerance. He should have been gone," said Lieberman, who is chairman of the Senate Committee on Homeland Security and Governmental Affairs.
In interviews Sunday, Army Chief of Staff Gen. George Casey stressed that it was too early in the investigation to know whether these warnings signs could have spared the lives of the 13 killed, dismissing earlier reports about such signs as "speculation" based on anecdotes. "I don't want to say that we missed it," he said.
Finnell said that once Hasan was identified as the suspect in Thursday's massacre, he reached out to the Army to tell them about his experiences with Hasan.
This time, he said, "They listened."
Fox News' Jonathan Passantino and Jana Winter contributed to this report.