Kennedy Lincoln Continental<span class="anchor" id="Kennedy X-100 (1961–1977)">
President John F. Kennedy's 1961 Lincoln Continental was originally a stock car, built in Wixom, Michigan, and retailing for US$7347 1961. The federal government leased it from the Ford Motor Company for US$500 1961 annually, and then commissioned Hess and Eisenhardt to modify it for presidential use—with a pricetag of US$200000 1961. The convertible was painted "Presidential Blue Metallic", with silver metal flakes embedded within it; it was given the Secret Service code names of SS-100-X and X-100.
The dark-blue car included a "heavy-duty heater and air conditioner, a pair of radiotelephones, a fire extinguisher, a first-aid kit, and a siren." The stock car was stretched 3.5 ft to accommodate a foldable center row of forward-facing jump seats. The exterior featured retractable standing platforms and handles for Secret Service agents, and flashing red lights recessed into the bumper. Unique to the X-100 were three removable roofs (made of fabric, lightweight metal, and transparent plastic) and a hydraulic lift that could raise the rear cushion 10+1/2 in off the floor. Both of these feature sets were designed to make the president more visible to the public, but they also increased the president's vulnerability—a factor in the 1963 assassination of John F. Kennedy.
After the assassination, the "Death Car" (as named by the Associated Press), was rebuilt in an operation named "The Quick Fix". Hess and Eisenhardt, the Secret Service, the United States Army Materials and Mechanics Research Center, PPG Industries, and Ford engineers all collaborated to strip the limousine and make substantial improvements. In an effort to prevent "ghoulish collectors" from obtaining discarded car parts, they were destroyed. For an estimated cost of $500,000, the car was painted black; received improved telecommunications gear; its fuel tank was protected against explosion by a "porous foam matrix" that minimized spillage in the event of a puncture; and the passenger compartment was protected by 1600 lbs of armor. The three removable roofs were replaced by a fixed glass enclosure that cost more than $125,000; the glass enclosure was made of 13 different pieces of bulletproof glass ranging in thickness from 1 to 1+13/16 in, and was then the largest piece of curved bulletproof glass ever made. Titanium armor was added to the body of the car, the standard windows were made bullet-resistant with sandwiched layers of glass and polycarbonate vinyl, and prototype aluminum run-flat tires were added. To compensate for the 25 percent increase in weight—to 9800 lbs—the upgraded car received a hand-built 350 hp V8 engine, providing 17 percent more power.
In 1967, the car was modified again with an upgraded air conditioning system, an openable rear-door window, and structural enhancement to the rear deck. Despite successive presidential state cars being built and delivered to the White House, the X-100 continued to be occasionally used by Presidents Lyndon B. Johnson, Richard Nixon, Gerald Ford, and Jimmy Carter until it was retired from service in early 1977. As of March 2021, it was publicly exhibited at the Henry Ford museum in Dearborn, Michigan.
The license plates (DC plates, "GG-300") were removed from the X-100 when the vehicle was upgraded after the Kennedy shooting. When they were auctioned in 2015, they sold for US$100000 2015.