U.S. President Donald Trump paid tribute Monday to the men and women who gave their lives fighting for the nation's freedom. He laid a wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery outside of Washington, DC. It is the country's most prominent cemetery for U.S. service men and women. Former Vice President Joe Biden, the presumed democratic nominee running for President visited a memorial near his home in Delaware. The weekend holiday is also the unofficial start of the summer vacation season as the country copes with a new reality amid the coronavirus pandemic.