Justin Sullivan, Getty Images

(AP) - Three South Dakota firefighters killed in the line of duty last year will be honored at a national ceremony next month.

Trampus Haskvitz, Jacob Waldner and William Waldner will be remembered during the 31st annual National Fallen Firefighters Memorial Service in Emmitsburg, Maryland on October 7th.

The 23-year-old Haskvitz of Buffalo Gap died while fighting a forest fire in the Black Hills last August.

Twenty-year-old Jacob Waldner and 22-year-old William Waldner with the Sunset Fire Department died in an explosion last September while they were helping fight a coal bin fire at the Sunset Hutterite Colony.

The three are among 80 firefighters being honored during the memorial service on the grounds of the National Fire Academy.