In the United States, Flag Day is celebrated on June 14. It commemorates the adoption of the flag of the United States, which happened that day by resolution of the Second Continental Congress in 1777.

Memorial Day is a United States federal holiday observed on the last Monday of May (May 31 in 2010). Formerly known as Decoration Day, it commemorates U.S. men and women who died while in the military service. First enacted to honor Union soldiers of the American Civil War (it is celebrated near the day of reunification after the Civil War), it was expanded after World War I.

In the United States, Armed Forces Day is celebrated on the third Saturday in May. It falls near the end of Armed Forces Week, which begins on the second Saturday of May and ends on the third Sunday of May.

The day was created in 1949 to honor Americans serving in the five U.S. military branches – the Army, Navy, Marines, Air Force, and Coast Guard – following the consolidation of the military services in the Department of Defense. It was intended to replace the separate Army, Navy, Air Force, Marine Corps, and Coast Guard Days, but observance of these days, especially within each particular service, continues to this day.

The first Armed Forces Day was celebrated by parades, open houses, receptions and air shows. The United States’ longest running city-sponsored Armed Forces Day Parade is held in Bremerton, WA. In 2009, Bremerton celebrated the 61st Armed Forces Day Parade.

Because of their unique training schedules, National Guard and Reserve units may celebrate Armed Forces Day/Week over any period in May.