Rock served in the U.S. Army during World War II in Saint-Lô, France. He ran in to Kendra Saunders, who was running away from Vandal Savage, thinking that she was trying to escape the Nazis. He gave her a pen and paper to write with, before allowing her to stuff her note in to his helmet. He was promptly stabbed with a knife by Savage, killing him. His helmet eventually entered the possession of Rip Hunter aboard the Waverider.
DC's Legends of Tomorrow
- Helmet: While fighting in World War II Rock wore this helmet to protect his head from gunshots and gaining injuries, after his death at the hands of Vandal Savage the helmet was acquired by Rip Hunter.
- M1928A1 Thompson: Rock wielded this submachine gun during World War II.
Behind the scenes
- Although not named during his appearance, his helmet was identified via DC Comics' official Instagram.
- In the DC Comics, Sgt. Frank Rock was an American army officer and leader of the infamous Easy Company unit.