[Prophet in the wilderness]

Yes, basically, it is the 707, but, under the military classification it is the KC/C - 135 Tanker.
The 707 ( originally the DASH 80 is the first 707 , you can see the prototype at the AIR and SPACE museum near DULLES airport ) and the KC/C - 135 Tanker are the same plane.

[steveegg]

Yes, basically, it is the 707, but, under the military classification it is the KC/C - 135 Tanker.

Israel's tankers are conversions of the 707, which due to its 4-inch-wider cabin, is differentiated from the -135 family by Boeing (indeed, Boeing briefly used the 717 designation before adopting the USAF designation of C/KC-135). The only countries to actually buy -135s off the line are the US and France (-F models); the US later sold some surplus aircraft to Turkey and Singapore.

Also, 707s that were used for transport by the USAF/USN (as opposed to radar and C3 duty) were termed C-137s (the most famous of which were the former Air Force Ones).