They came from all across America: from Connecticut to Florida to Illinois, and many points in between.

One had been in the Marines for nearly four and a half years, another for just a few months. Many served in Afghanistan, earning numerous honors before making it safely back home to the United States.

On Wednesday, the military released the names of the seven Marines killed Monday night during a training exercise at Hawthorne Army Depot in western Nevada. They were all under 26.

"Our hearts, thoughts and prayers go out to the families and friends of our fallen angels," said Lt. Col. Andrew J. McNulty, commanding officer of the 1st Battalion, 9th Marine Regiment.

Those killed are:

Lance Cpl. David P. Fenn II: The Polk City, Fla., resident joined the Marines in June 2010 and was promoted nine months later. In that time, he'd deployed to Afghanistan where, among other honors, he earned a NATO Medal-ISAF Afghanistan and Afghanistan Campaign Medal. The mortarman was 20.

"Remember him as he was and as who he could have been and in the future," retired Camp Lejeune Marine George Barrows told CNN affiliate WITN. "After all, he did it for our country."

Pfc. Joshua M. Martino: The 19-year-old from Clearfield, Pa., was a mortarman in the regiment. He joined the Marines in July, but already had earned the National Defense Service Medal and Global War on Terrorism Service Medal.

Friends said Martino wanted to be a Marine all his life and joined the Corps right out of high school, affiliate WTAJ reported.

"I not only salute him in his passing, but I salute everyone ... in the armed forces today," said Cmdr. David Gralla of Veterans of Foreign Wars Post 813.

Martino was engaged to his high school sweetheart and the couple were planning a wedding next year.

Lance Cpl. Roger W. Muchnick Jr.: The 23-year-old hailed from the southwestern Connecticut town of Fairfield and ended up in Afghanistan as a mortarman with the 1st Battalion, 9th Marine Regiment.

Like his fallen colleagues, he amassed a host of honors in his military career, such as the Global War on Terrorism Expeditionary Medal and Sea Service Deployment Ribbon.

Muchnick played sports at Eastern Connecticut State University before leaving school early to enlist. The decision wasn't a surprise to his lacrosse coach Justin Axel.

"I knew that he would thrive in that situation. He was that kid that would do everything you tell him to do, was great at following orders," Axel told affiliate WTNH. "He was just one of those tough, hard-nosed kids that you'd just dream of having."

Cpl. Aaron J. Ripperda: At 26, he was the most senior of those killed Tuesday, both in his age and rank. The Madison, Ill., resident joined the Marine Corps in September 2008, with his latest promotion to corporal coming in April 2011. Among his numerous honors were a Navy Unit Commendation and a Humanitarian Service Medal.

Ripperda was just nine weeks away from ending his career in the military, after serving tours in Haiti and Afghanistan, his father, Kurt Ripperda, told affiliate KSDK. His parents were relived once he came back to the States, figuring he was safer closer to home.

"No matter if it would've been nine weeks or three years, it just hurts," Ripperda said. "He was so close to getting out, but he was a good Marine. I was proud of him."

Ripperda loved cooking and sailing, and had plans to buy a new boat once he moved back home.

Lance Cpl. Joshua C. Taylor: The Marietta, Ohio, resident, 21, was a teenager when he joined the Marines in June 2010. In 2011, the decorated mortarman was promoted to lance corporal, the same year he deployed to Afghanistan as part of Operation Enduring Freedom.