According to my list of witnesses, neither Siebert nor O'Neill were ever called to testify before the WC, the HSCA, or the ARRB. So where does that leave us determining what they meant by a missile?
A receipt made out to Captain J.H. Stover, Jr., Commanding Officer, U.S. Naval Medical School, National Naval Medical Center, Bethesda, Maryland.
That clearly states (a) missile.
singular. NOTHING about multiple fragments (2) - or "
portion of the projectile" wording used in the autopsy report.

I gotta go with [
vanishing] bullet.