(CNN) -- It's been a little over a year since President Barack Obama accused the Syrian government of crossing a "red line," with the use of poison gas against civilians. This week, the last of the country's declared chemical weapons stockpiles are sailing to their eventual demise.
On Wednesday, 600 metric tons of Syrian chemicals weapons were transferred from a Danish ship to the U.S. government container ship, the Cape Ray, at an Italian port, Gioia Tauro.
The Cape Ray is now set to sail into international waters, where the on-board process of neutralizing the chemicals will be carried out, according to the OPCW, the Organisation for the Prohibition of Chemical Weapons, which led the mission to remove and destroy the weapons
It will take 60 days to neutralize the chemicals safely and cleanly, the Pentagon said.
The rest of the chemicals will be destroyed at plants in the United States and Europe, but no active weapons grade materials will enter either of those places. By the time they arrive, they will be broken down to industrial chemicals.
The resulting hazardous waste will be further processed in Germany and Finland.
The chemical weapons left Syria on the Danish ship Ark Futura just over a week ago, bound for Italy.
It was a major milestone when the weapons left the Syrian port of Latakia, said Ahmet Uzumcu, the chief of the OPCW.
"Never before has an entire arsenal of a category of weapons of mass destruction been removed from a country experiencing a state of internal armed conflict," he said.
But inspectors can't say for sure that some undeclared weapons aren't still lurking somewhere in the country.
Syria's civil war has dragged on since 2011, and in 2013 images surfaced of civilians who allegedly died from poison gas attacks.
The nonpartisan Doctors Without Borders then reported that three hospitals near Damascus treated more than 3,000 patients suffering "neurotoxic symptoms."
The United Nations firmed up the accusations after sending inspectors into the country.
The White House has stepped up U.S. military support to rebels fighting the forces of President Bashar al-Assad, though it stopped short of putting weapons in their hands.
The U.N. Security Council passed a resolution requiring Syria to eliminate its chemical weapons arsenal, and al-Assad promised to adhere to the resolution. The following month, Syria began dismantling its chemical weapons program.
The OPCW reported that Syrians were using torches and grinders to destroy or disable weapons such as missile warheads and aerial bombs.
Despite the apparent end to a chapter in the history of Syria's chemical weapons, on the ground in Syria, trauma and bloodshed continue.
CNN's Hada Messia and Ashley Fantz contributed to this report.