PELHAM, N.H. — As the hearse carrying Army Sgt. Daniel Gionet’s casket rolled by Pelham High School, hundreds of students lined the sunny street Friday to pay their respects to the graduate killed in Iraq.

It was the same scene outside the town’s elementary and middle schools — pupils holding American flags formed a human guardrail, watching silently as the motorcade made its way to St. Patrick’s Church for Gionet’s funeral.

American flags also adorned the church, where mourners filled the pews and a downstairs room where a video screen was set up. The service was followed by burial at Gibson cemetery in Pelham.

Gionet, a newlywed and Army medic, was killed June 4 when an explosion hit his tank in Taji, Iraq. He was 23, and the sixth New Hampshire serviceman killed overseas this year. His widow, Katrina, is 19. They married last November, and he was expected back...