Kent Ripperda said his son was eager to go back to college and "get on with his life."
Roger Muchnick, 23, who grew up in Westport, Conn., had already pulled one tour in Afghanistan and was thinking about returning to college after his enlistment was up, said his grandfather, Jerome Muchnick.
Muchnick played on the football and lacrosse teams at Staples High School and went on to play lacrosse at Eastern Connecticut State University, where he studied business. In a biography on the university's website, Muchnick said the one thing he would like to do before he died was "live," and that his most embarrassing moment was getting caught lip-synching in a school talent show.
"He was a fabulous kid. Just fabulous," his grandfather said. "He was at the top of his game when this happened. ... You can't imagine losing a very handsome, 23-year-old grandson who was vital and loving."
Lance Cpl. William Taylor Wild IV, 21, joined the Marines shortly after graduating in 2010 form Severna Park High School near Annapolis, Md. His mother, Elizabeth Wild, said he was in a weapons platoon that was scheduled to deploy to Afghanistan in November. He already had been deployed twice to Afghanistan and once to Kuwait.
Wild said her son always wanted to go into the military, like his father, who is a command chief in the Air Force Reserve at Dover Air Force Base in Delaware.
The military Wednesday night identified the other Marines who were killed as Lance Cpl. David P. Fenn II, 20, of Polk City, Fla., and Lance Cpl. Mason J. Vanderwork, 21, of Hickory, N.C.
Both joined the Marines in June 2010 and were deployed to Afghanistan in 2011, a spokesman for the 2nd Marine Expeditionary Force said in a written statement.
The explosion Monday caused an immediate suspension of the use of 60 mm mortars by the Marine Corps, with an exemption for troops in Afghanistan, U.S. military and Marine officials said. Marine units on the warfront may continue to use the mortars with the review and approval of their commanders. U.S. military officials in Afghanistan said they have not stopped using the mortars there.
The suspension, which will be in effect until the accident investigation is complete, largely affects units that are training, although those Marines could use the larger and more powerful 81 mm mortar systems if needed.
At Camp Lejeune, an 170-square-mile base and home to about 50,000 uniformed troops, counselors at the Naval Hospital were gearing up to offer help as the ripples from Monday's tragedy began reaching family and friends, barracks mates and survivors, said Dr. Sawsan Ghurani, director of mental health programs at the hospital.
"It's so unexpected that it's more of a shock than if you'd been mentally prepared" for battlefield casualties, said Ghurani, a psychiatrist and Navy captain. "You hope people don't die in war, but it is a common occurrence and whereas, in training exercises, it's very rare."
The ages of the victims make it even worse, Ghurani said.
"For me, it's especially tragic when they are so young and still have so much left to give in life and to experience in life that it just seems unfair," she said. But, she added, "The nature of the military culture is to be selfless."
Contributing to this report were Associated Press writers Ted Bridis, Lolita Baldor and Pauline Jelinek in Washington, Scott Sonner and Martin Griffith in Reno, Nev., Michelle Rindels and Ken Ritter in Las Vegas, Mitch Stacy in Columbus, Ohio, Jim Suhr from St. Louis, and Dave Collins in Hartford, Conn.