The public Quizlet set contained information about alleged codes for specific facility entrances. 'Checkpoint doors code?' asked one card, with a specific four-digit combination listed in response.
The marine told investigators he found the round in the field about a year ago and kept it, thinking it wasn't live. Due to extensive rust and corrosion, the round's original identifying paint markings were no longer visible, making it difficult to determine whether it was an inert training munition or a live explosive device.