The US military said that over the next month all soldiers will receive training to reinforce "core warrior values training, highlighting the importance of adhering to legal, moral and ethical standards on the battlefield."
The training will emphasise "the importance of disciplined, professional conduct in combat, Iraqi cultural expectations and the second and third order effects of actions that are contrary to professional military values."
"They do the right thing even when no one is watching," said Lieutenant General Peter Chiarelli, the number two US general in Iraq, in a statement.
"Unfortunately, there are a few individuals who sometimes choose the wrong path," he said.
"As military professionals, it is important that we take time to reflect on the values that separate us from our enemies. The challenge for us is to make sure the actions of a few do not tarnish the good work of the many," the statement said.
Civilians are increasingly bearing the brunt of the violence in the conflict-ridden country with the health ministry reporting 932 civilians killed in May, a 36 percent increase over April.
On Wednesday two Iraqi women, one pregnant, were shot dead at a US checkpoint as they were being rushed to the delivery room in the central city of Samarra.
Though such incidents have occurred many times since the US-led invasion, they have come under new scrutiny in the wake of investigations into the alleged killings in Haditha.
Iraqi Prime Minister Nouri al-Maliki condemned the November 2005 incident in the western town of Haditha that resulted in the deaths of 24 civilians and called for a review of coalition forces' rules of engagement.
"We must speak with them and fix a definition of the obligations of foreign forces," he said.
"The cabinet will follow up on this matter with the multinational forces and we will issue a statement to denounce the event and reveal others like it that have happened."
Two US investigations are underway -- one into the incident itself, and another into whether there was a coverup by the marines.
The US military said at least three other cases of alleged misconduct are being investigated, however no details have been given.
Marine relieved of command
Meanwhile a Marine captain has been relieved of his command after members of his battalion were accused of killing civilians in Haditha.
Captain James Kimber has denied any role in the slayings and says he's become a "political casualty."
"It makes my blood boil to see my name lumped in with this massacre, when I was in a different city not playing any role in this incident," Capt Kimber told The Associated Press.
Capt Kimber, 33, was one of three officers reassigned to new duties last month for what the Marines said was "a lack of confidence in their leadership abilities." None of the three officers has been charged with wrongdoing.
Capt Kimber said he first learned about the shootings in February when he heard that a Time magazine reporter was asking questions about civilian deaths.
He said he was removed because senior commanders at California's Camp Pendleton were scrambling to defuse an explosive situation.