Four Army soldiers based in southeast Georgia killed a former comrade and his girlfriend to protect an anarchist militia group they formed that stockpiled assault weapons and plotted a range of anti-government attacks, prosecutors told a judge Monday.

Prosecutors in rural Long County, near the sprawling Army post Fort Stewart, said the militia group of active and former U.S. military members spent at least $87,000 buying guns and bomb components. They allege the group was serious enough to kill two people — former soldier Michael Roark and his 17-year-old girlfriend, Tiffany York — by shooting them in the woods last December in order to keep its plans secret.

"This domestic terrorist organization did not simply plan and talk," prosecutor Isabel Pauley told a Superior Court judge. "Prior to the murders in this case, the group took action. Evidence shows the group possessed the knowledge, means and motive to carry out their plans."

One of the Fort Stewart soldiers charged in the case, Pfc. Michael Burnett, also gave testimony that backed up many of the assertions made by prosecutors. The 26-year-old soldier pleaded guilty Monday to manslaughter, illegal gang activity and other charges. He made a deal to cooperate with prosecutors against the three other soldiers.

Prosecutors said the group called itself F.E.A.R., short for Forever Enduring Always Ready. Pauley said authorities don't know how many members it had.

Burnett, 26, said he knew the group's leaders from serving with them at Fort Stewart. He agreed to testify against fellow soldiers Pvt. Isaac Aguigui, identified by prosecutors as the militia's founder and leader, and Sgt. Anthony Peden and Pvt. Christopher Salmon.

Ultimately, prosecutors said, the militia's goal was to overthrow the government and assassinate the president.

All are charged by state authorities with malice murder, felony murder, criminal gang activity, aggravated assault and using a firearm while committing a felony. A hearing for the three soldiers was scheduled Thursday.