Green wreaths on white headstones for as far as the eye can see at Arlington National Cemetery

Arlington National Cemetery welcomed thousands of volunteers to help with this year’s National Wreaths Across America Day — one of the most hallowed holiday traditions in the D.C. area.

“They’re here because they want to show these Gold Star families, our active duty military and especially their children about how important it is to recognize that we have the freedom to enjoy the upcoming holidays,” Karen Worcester, executive director of Wreaths Across America, said about volunteers who...