"A hex-shaped stone object. A picture of a submarine is carved on it."
"６角形をした石のオブジェ 潜水艦の絵が刻まれている "
The Navy Proof (海軍の証 kaigun no akashi ) is an event item in Resident Evil CODE:Veronica.
The Navy proof can be found near the collapse entrance of the official residence vestibule.
During Chris's scenario, the player can find this Navy Proof at the same place where Claire and Steve previous left it.