ARLINGTON, Va. — (AP) — Americans gathered at memorials, museums and monuments and the president laid a wreath at Arlington National Cemetery to honor fallen service members on Memorial Day, as combat in Afghanistan approaches 12 years and the ranks of World War II veterans dwindle.

“Let us not forget as we gather here today that our nation is still at war,” President Obama said after laying a wreath at the Tomb of the Unknowns.

“When they give their lives, they are still being laid to rest in cemeteries in quiet corners across our country, including here in Arlington,” he said. He told the stories of three soldiers who had died. Each had been devoted to their mission and were praised by others for saving lives.

At the National World War II Museum in New Orleans, about 20 bicyclists clustered around veteran and museum volunteer Tom Blakey. The paratrooper in the 82nd Airborne Division jumped at Normandy on D-Day — June 6, 1944 — and in May 1945 helped liberate the work camp at Wobbelin in northwest Germany.

“Most of us wondered why we were there, killing people and being killed,” he said. “We didn’t do anything to deserve it. When we got to that camp and saw what was there, the lights came on.”

The cycling group makes regular weekend training runs, and on Monday started a Memorial Day ride about seven miles away at the national cemetery in Chalmette, where the Battle of New Orleans — the last in the War of 1812 — was fought.

“I’m glad I took this ride to hear a personal story,” Scott Gumina, 41, said. “Hearing one man’s account of his personal experience was pretty impressive to me.”