A mortar shell explosion Monday at an Army depot in Hawthorne, Nev., killed seven Marines and injured eight other servicemen. Here are profiles of victims identified by family members:

AARON RIPPERDA, 26

Ripperda was a football player while he attended high school in Highland, Ill., near St. Louis. He was respectful and hardworking, according to Highland High School Assistant Principal Karen Gauen, and "definitely had the discipline for the military."

Ripperda had dreams of becoming a professional chef. His aunt, Beverly Lesicko, told the St. Louis Post-Dispatch he joined the Marines for a chance to explore the world. He was scheduled to come home in May.

Marine Lance Cpl. Taylor, who worked with mortars and served tours in Afghanistan and Kuwait, had dreamed being in the Corps since watching the History Channel as a boy. He joined right after graduating from a high school in Marietta, Ohio, in 2010.

Taylor's grandfather, Larry Stephens, said Taylor was engaged to be married, with a wedding planned for May.

His fiancee's father called him an exceptional person.

"You don't meet many young men like him today," Keith Malone told The Marietta Times. "He was respectful to everyone, very humble, just happy, happy all the time."

Taylor is also survived by three sisters and a brother.

ROGER MUCHNICK, 23

Muchnick, who'd been in the Marines for about three years, had served in Afghanistan and was considering returning to college after his enlistment was up. He played high school lacrosse and football in Westport, Conn., and later played 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 his most embarrassing moment was getting caught lip-synching in a school talent show.

"He was at the top of his game when this happened," said his grandfather, Jerome Muchnick. "You can't imagine losing a very handsome, 23-year-old grandson who was vital and loving."

JOSH MARTINO, 19

Pfc. Martino, who hailed from Dubois, Pa., and was preparing for a deployment to Afghanistan, aspired to be a Marine since boyhood.

"Since he was probably 8 years old he wanted to be a Marine," said his mother, Karen Perry. "That's all he wanted to do."

Martino was a talkative former high school athlete and accomplished hunter who hoped to marry his fiancee later this year, Perry said.

His mother said she first heard a radio news report about the Monday accident, then three Marines arrived at her workplace to say her son was among the seven dead.