President Donald Trump, first lady Melania Trump and U.S. Secretary of Defense Pete Hegseth salute at a military parade to commemorate the U.S. Army's 250th birthday on the day of President Donald ...

America’s oldest military service turns 250 on Saturday. If you see an active duty, former, or retired member of the Army, wish their service a happy birthday.

WATCH: President Donald Trump got a birthday sendoff at a major military parade in downtown Washington, D.C., Saturday night as he turned 79.