- "Dude, it's just a helmet!"
- —Jefferson Jackson on Sgt. Rock's helmet[src]
While touring in Saint-Lô in 1943, Rock ran into the time traveler Kendra Saunders. She recognized the helmet due to its distinctive bullet holes and used it to hide a message for Rip Hunter and his team. After Rock was killed by Vandal Savage, the helmet fell off his head and onto the ground.
At an unknown point in time, Rip Hunter acquired the helmet, and kept it aboard the Waverider in his personal collection of relics. When the team was discussing plans on how to find and rescue Kendra, Jefferson Jackson accidentally knocked the helmet off the table. Noticing that he didn't remember coming into possession of this item, Rip Hunter examined the helmet and found the note hidden by Kendra, describing when and where she had been taken by Savage.
DC's Legends of Tomorrow
Behind the scenes
- This helmet was identified as Sgt. Rock's via DC Comics' official Instagram. 
- In the DC Comics, Sgt. Frank Rock possessed a similar helmet.