"We take everything they say and everything they do very seriously, " Pentagon spokesman George Little said.
After the latest incident, Mr Little said the US would continue surveillance in the area.
Pentagon Press Secretary George Little said U.S. officials are assessing reports of chemical weapons use in Syria.
Pentagon Press Secretary George Little said Defense Secretary Chuck Hagel was notified of the deaths at Quantico.
WSJ: Three Dead, Including Suspect, in Shooting at Quantico Marine Base
Mr Little said Mr Panetta was calling on Afghanistan to take decisive action to protect Nato forces.
"This could not have come at a better time for me and my family, " Mr Little said.
BBC: Dumfries couple Barry and Roberta Little scoop lottery win
"They deserve credit for their second-half attitude towards the man down and an aggressive game plan, " Little said.
"I think the world needs all of these kinds of systems, " Little said.
"We hope Congress can find a way to end sequester once and for all, " Pentagon spokesman George Little said.
"My own view is there things can be managed, " Little said of concerns about drilling, adding they need to be managed carefully.
"We intend to make the facts about that past policy known to the loved ones of those who died, " Mr. Little said.
WSJ: Claims That Sept. 11 Remains Were Buried in Landfill are Challenged
"The development of this weapon is not intended to send a signal to any one particular country, " Pentagon press secretary George Little said.
Conservative candidate Antony Little said the plan for a unitary council was "not affordable" and "has no measure of support by local people".
British Dietetic Association spokeswoman Melissa Little said there were ways to make the toast sandwich much better for not that much more money.
Press secretary George Little said Afghan Defence Minister Gen Abdul Rahim Wardak had called US Defence Secretary Leon Panetta to apologise for the shootings.
Dr Little said doctors did often feel under pressure to prescribe.
When the American fighter planes escorting the drone approached the Iranian plane, it broke off its pursuit of the drone, Pentagon Press Secretary George Little said.
But Pentagon Press Secretary George Little said U.S. officials expect that SCAF "will transfer full power to a democratically elected civilian government, " as it had promised.
"This tragedy, as well as the tragedy in Nevada earlier this week, took the lives of Marines who volunteered to serve their nation, " Mr. Little said.
WSJ: Three Dead, Including Suspect, in Shooting at Quantico Marine Base
After that incident, Mr. Little said in his statement, the U.S. told Iran it would conduct surveillance flights in international airspace and that it would protect its assets.
Speaking to the House of Commons environmental audit committee yesterday, the company's Dr Julian Little said that Europe was in danger of "enshrining some sort of museum agriculture".
Pentagon spokesman George Little said the president had been informed.
He also told his South Korean counterpart that the US-South Korea alliance was "instrumental in maintaining stability on the Korean peninsula", Pentagon spokesman George Little said in a statement.
"The United States communicated to the Iranians that we will continue to conduct surveillance flights over international waters consistent with long-standing practice and our commitment to the security of the region, " Mr. Little said.
"Secretary Hagel has been directing the Department's leaders to elevate their focus on sexual assault prevention and response, and he will soon announce next steps in our ongoing efforts to combat this vile crime, " Little said Monday.
Meanwhile, the U.S. Air Force has flown five C-17 flights into Bamako, delivering more than 80 French troops and 124 tons of equipment thus far in an ongoing airlift operation, Pentagon press secretary George Little said Tuesday.
Pentagon spokesman George Little said the role of the U.S. military in Niger "has not yet been defined" -- but Niger's ambassador to the United States, Maman Sidikou, told CNN that his government has agreed to let U.S. drones operate from its territory.
CNN: U.S. to base surveillance drones in Niger, ambassador says
Press secretary George Little said he didn't know whether the U.S. would have access to the pilot to question him, but he said there have been "countless incidents" of members of the Syrian regime seeking to defect, and predicted more such moves to come.
"This is a serious issue, and ... the United States is committed to going after terrorists wherever they may be in order to protect American interests, but also those of our partners and allies around the world, " Pentagon spokesman George Little said last week.
"This is a serious issue, and ... the United States is committed to going after terrorists wherever they may be in order to protect American interests, but also those of our partners and allies around the world, " Pentagon spokesman George Little said this week.
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