The late president's son George W. Bush marked the holiday with a bike ride to honor fallen service members.

Sully the service dog sits next to George H. W. Bush's casket
Credit: Patrick Semansky/AP/REX/Shutterstock

George H. W. Bush‘s former service dog, Sully, posed for a photo to pay tribute to the 41st president of the United States on Memorial Day.

“Always thinking of my best friend & the bravest military in the world