July 17, 2015 12:02 PM EDT

Officials have released the names of the four Marines who were killed in Chattanooga, Tenn. on Thursday by a shooter authorities are describing as an apparent “lone wolf” gunman. The servicemembers were murdered at a naval reserve facility in Chattanooga that is used to train Marines and sailors for reserve duty. Here’s what we know so far about the four Marines that were killed.

Thomas Sullivan

Gunnery Sgt. Thomas Sullivan, 40, was a native of Springfield, Mass. He served two tours of duty in Iraq and earned a Purple Heart, according to the Boston Globe. The India Battery, 3rd Batallion 12th Marines identified Sullivan as one of its servicemembers in a Facebook post. Sullivan had been a Marine since 1997, according to his own Facebook profile.

Nathan Bill’s Bar and Restaurant, a Springfield business owned in part by Sullivan’s brother Joseph, posted a tribute to the fallen Marine Friday.

Massachusetts Governor Charlie Baker also offered condolences via Facebook. “Terror comes home to Massachusetts,” he wrote. “God Bless Tom Sullivan and his family and friends.”

Skip Wells

Skip Wells, 21, of Marietta, Ga. was also among the Marines who died Thursday, a spokesman for Wells’ family told the Atlanta-Journal Constitution. Wells attended Georgia Southern University before joining the Marines. In high school, Wells participated in the marching band and played the clarinet, a friend told the AJC.

Carson Holmquist

Sgt. Carson Holmquist of Grantsburg, Wisconsin, enlisted in the Marines in January 2009 after graduating from Grantsburg High School. He had been deployed twice, according to the Associated Press, as part of Operation Enduring Freedom.

When he finished his training, he returned to his alma mater where he had played cornerback on the football team wearing his formal uniform, Grantsburg High School Principal Josh Watt told the AP.

Watt added, “When he became a Marine he was very proud of that.”

David Wyatt

Staff Sgt. David Wyatt had served three deployments, two of which were in Iraq, after he joined the Marines in 2004, the Associated Press reports. Wyatt lived in Burke County, North Carolina, and graduated from high school in Russellville, Arkansas in 1991.

A caring, hard-worker, Wyatt had earned the Eagle Scout rank, his old troop master, Tony Ward, told the AP. Ward added the Marine had been married and had young children.

“He’s the kind of man that this country needs more of,” Ward said.

Contact us at editors@time.com.

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