In the USA Today story linked below, Burkett names "Lucy Ramirez" as his real source. (Burkett originally told USA Today and CBS that George Conn, an ex-Guardsman, was his source--but he now admits that was a lie.)
But USA Today speaks of Burkett's "inability to supply evidence to show that Ramirez exists" (my emphasis). Let me go out on a limb here to make a prediction: "Lucy Ramirez" is a figment of Burkett's imagination. Curioser and curioser.