This is a Notable Operational milestone.
President Dwight D. Eisenhower flew in a Bell H-13J VIP variant, piloted by Major Joseph E. Barrett. The aircraft first landed on the White House lawn on May 31, 1957.
The aircraft is on display at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, VA, USA.
Source: Ike and the First Presidential Helicopters, Roger Connor, Airspace Blog, National Air and Space Museum, July 12, 2010