An early photograph of one of the three commercial Boeing 707-153s procured by the USAF as high-level government transports, designated VC-137As and operated in MATS markings.

Тот же самолет уже в варианте VC-137B - с удлиненным килем, подфюзеляжным гребнем и новыми двигателями. Вариант окраски с белым верхом несут самолеты, использующиеся для перевозки сотрудников правительства и высшего военного командного состава.
A later photograph of the one of the three commercial Boeing 707-153s procured by the USAF as high-level government transports, after conversion to VC-137B with fan engines and in the blue/whitefinish adopted by MAC for its VIP fleet.

Второй VC-137C (72-7000) в окраске президентского самолета.
Air Force One. the second of the two VC-137Cs; note that the ventral fin of the commercial 707-320C is not fitted.

The first production KC-135B in its original configuration. The designation was changed to EC-135C immediately after delivery to the USAF.

One of the NKC-135As (with refuelling boom retained) used for ionospheric measurement tests; the large number of windows led to the nickname "piccolo tube''.

An NKC-135A used by Aeronautical Systems Division (ASD) for radiation airborne measurements.

An early production C-135B as delivered in MATS livery.

Пять самолетов C-135B первой партии были переоборудованы в VIP-транспортные - они отличались комфортабельным салоном и получили обозначение VC-135B. Впрочем, во времена президента Картера их вновь переоборудовали в "обычные" C-135B.
Bearing the white top and blue trim of a VIP aircraft operated by the 89th MAW, this VC-135B lacks the cabin windows of the same unit's VC-137 variants of the commercial Boeing 707.

This modified and highly instrumented NKC-135A (55-3123) is currently serving as the Airborne Laser Laboratory at the AF Weapons Laboratory, Kirtland AFB. This photograph shows one of the earlier laser installations in a dorsal turret; earlier still, the same NKC-135A was a test-bed for the Northrop A-LOTS pod carried by the EC-135Ns.

One of the WC-135Bs used by MAC (and, originally, MATS) for meteorological duties. They were converted from C-135Bs.

One of three NC-135As equipped to monitor above-ground nuclear weapon tests and used for solar and cosmic research studies.

The NKC-135A used for the "Big Crow" missile vulnerability testing, showing the large radomes above and below the fuselage and the non-standard nose radome.

One of the two NKC-135As ( BuNo 563596) on loan to the USN’s Naval Electronic Systems Command, for electronic warfare research. Note the underwing radome between the engine pods.

A good air-to-air study of one of the EC-135N spacecraft trackers with A-LOTS pod fitted.

An RC-135U, showing the SLAR cheeks, wing and fin antennae and extended rear fuselage.

One of the two RC-135S reconnaissance aircraft, with unusual fairings and antennae on the forward fuselage.

The RC-135V is a further re-designation of the RC-135C, with large blade aerials under the fuselage.

One of the 10 RC-135Bs in original production configuration.

KC-135R. Не следует путать вариант KC-135R с самолетом-заправщиком KC-135R (с замененными позднее двигателями). Первые четыре машины KC-135R были переоборудованными в разведчики самолетами KC-135A. Три KC-135R были переделаны в версию RC-135W для британских ВВС.
A KC-135R, showing the original jet engines and refuelling boom retained.

The RC-135D was the first variant to feature the “thimble" nose radome and the long tubular fairings on the fuselage sides.

One of the four EC-135Gs, photographed in August 1980.

One of the five EC-135Hs, in a display fly-past with the refuelling boom fully extended.

A rarely-photographed EC-135J; turbofan engines identify this as one of the original production KC-135Bs.

One of TAC's EC-135K airborne command posts; this is the original first-production KC-135A.