VC-137C SAM 26000 VC-137C SAM 26000 SAM 26000 was the first of two Boeing VC-137C United States Air Force aircraft specifically configured and maintained for use by the President of the United States. It used the callsign Air Force One when the President was on board, "SAM 26000" otherwise. A VC-137C with Air Force serial number "62-6000", "SAM 26000" was a customized Boeing 707. It entered service in 1962 during the administration of John F. Kennedy and was replaced in Presidential service in 1972 but kept as a backup. The aircraft was finally retired in 1998 and is now on display at the
Boeing VC-25 board are connected with approximately 238 miles (383 km) of wiring, twice that of a regular 747. All wiring is covered with heavy shielding for protection from a nuclear electromagnetic pulse in the event of a nuclear attack. The aircraft also has electronic countermeasures (ECMs) to jam enemy radar, flares to avoid heat-seeking missiles, and chaff to avoid radar-guided missiles. All small arms and ammunition stores not under the physical possession of the Secret Service on board the VC-25s are stowed and secured by the Secret Service in separate locked compartments, each with a different locking mechanism for added security.