Retired Air Force Lt. Col. Robert Birchum was sentenced earlier this month to three years in prison after pleading guilty to an 793(e) violation, though that was less than half of the 78 months prosecutors sought.
According to court records, Birchum illegally kept top-secret National Security Agency documents on a thumb drive at his home in Tampa, Florida. Prosecutors said his motive for illegally retaining the documents remained unclear, but investigators found more than 300 classified documents at his home, in a storage container parked in his driveway and in his overseas quarters.
Birchum was never found to have given classified documents to anyone, according to court records.
In court filings, federal prosecutors say the average prison sentence for cases similar to Birchum's involving top-secret information is more than four years. (Trump, too, kept top-secret documents with him at his Mar-a-Lago estate, according to his indictment.)
Harold Martin, who worked as a contractor for the NSA, allegedly kept vast amounts of classified information strewn about his Maryland home, in his shed and even in his car. He was sentenced to nine years after pleading guilty to willful retention of 20 classified documents.