Emails from Zawahiri to Atef in the Spring of 1999 indicate that Ayman was a close student of the USAMRIID anthrax program.

"Results": [
    {
        "TypeName": "PER",
        "Text": "Zawahiri",
        "Start": 12,
        "End": 20
    },
    {
        "TypeName": "PER",
        "Text": "Atef",
        "Start": 24,
        "End": 28
    },
    {
        "TypeName": "PER",
        "Text": "Ayman",
        "Start": 65,
        "End": 70
    },
    {
        "TypeName": "ORG",
        "Text": "USAMRIID",
        "Start": 98,
        "End": 106
    }
]