Yale’s alumni records include information about many Skull and Bones members from the relevant period, including information about their service records and their presence at various locations during World War I.

If records confirm that Prescott Bush and the other named individuals were at Fort Sill in May 1918, that corroborates one element of the account.

The broader Yale archives related to the World War I period — which Wortman was researching when he discovered the Mead letter — likely contain additional correspondence among Skull and Bones members from that era.

Systematic research through those archives, specifically looking for references to the Geronimo story, might reveal additional documentation.

Whether such research has been conducted, and by whom, is not fully documented in the public record.