Fourth, avoid setting a specific pattern of travel or other activity such as visiting the same church at the same time each Sunday.
Regarding public appearances. First, use maximum feasible screening of persons in attendance including use of detection devices sensitive to the amount of metal required in a firearm or grenade.
Second, use a bulletproof shield in front of the entire rostrum in public appearances such as the swearing in ceremony at the Capitol on inauguration day, the presidential reviewing stand in front of the White House on the same day and on the rear of trains.
Third, keep to a minimum the President's movements within crowds, remain on the rostrum after the public addresses rather than mingling with the audience. Again, there is great difficulty in that field.
Fourth, in appearances at public sporting events such as football games, remain in one place rather than changing sides during half-time ceremonies.
(Discussion off the record.)
Mr. Dulles. About the armored car you said if Kennedy had an armored car that might have saved him. Would the back of the armored car have some protection to protect his head?
Mr. Hoover. Oh, yes.
Mr. Dulles. Because if the armored car had been open——
Mr. Hoover. He must never ride in an open car; that has been my recommendation.