Portage and Columbia County’s first responders will conduct a memorial service Sunday, marking 15 years since the terrorist attacks of Sept. 11, 2001. The event will begin at 6:45 p.m. with a silent procession along West Conant Street starting near Sunset Park, with members of the Portage Police Department, Portage Fire Department, Columbia County Sheriff’s Office and Divine Savior Healthcare Emergency Medical Technicians proceeding to Pauquette Park. At Pauquette Park an invocation will precede a flag ceremony and candlelight vigil, remembering 2,996 lives lost on the morning of Sept. 11, 2001, when American Airlines Flight 11 and United Airlines Flight 175 were hijacked and flown into the World Trade Center in Lower Manhattan, American Airlines Flight 77 was flown into the Pentagon in Arlington, Virginia, and United Flight 93 was crashed into a field in Stonycreek, Pennsylvania after passengers wrested control of the plane from hijackers. The total number of fatalities resulting from the terrorist attack have yet to be determined as first responders continue to deal with the long-term health consequences of working days of search and rescue at and around the site of the World Trade Center. The ceremony is expected to last about an hour, according to Portage Fire Chief Clayton Simonson, ending with shared songs and bagpipes.