LOWELL — At L&I Army-Navy Store on Market Street, Glenn Morales engraves stainless steel dog tags on a graphotype machine used in World War II. The tags are his biggest seller at the store he opened three years ago.

“A lot of people get them for their pets or to put their own medical information on it,” said Morales, 39, a Marine veteran, who served for 13 years. “I bought the machine for $50 from another veteran. He had it for 30 years. He could have sold it for more. He wanted to help me out.”