Retired Aerospace Chief Scientist / Acoustical Society of America (ASA)
One of my interests is acoustic research regarding all of the vehicle sirens in the JFK motorcade on 22 Nov 1963. I have collected working sirens identical to those on the Harley motorcycles, Secret Service Cadillac and JFK Lincoln. The JFK Lincoln is the most interesting one as it appears to have been a PA 10 electronic siren. The Lincoln today at the Ford Museum still has the Federal Signal CP-25 speakers in the front wheel wells.