Boeing KC-135 Stratotanker operator United States Air Force
United StatesUnited States Air Force operates 398 KC-135s (156 Active duty, 70 Air Force Reserve, and 172 Air National Guard) as of May 2017.57th Wing – Nellis Air Force Base, Nevada
509th Weapons Squadron  – Fairchild Air Force Base, Washington
97th Air Mobility Wing  – Altus Air Force Base, Oklahoma
54th Air Refueling Squadron
412th Test Wing – Edwards AFB, California
412th Flight Test Squadron
418th Flight Test Squadron
6th Air Refueling Wing – MacDill AFB, Florida
50th Air Refueling Squadron
91st Air Refueling Squadron
99th Air Refueling Squadron – Birmingham Air National Guard Base, Alabama (Associate with 117th ARW)
22d Air Refueling Wing – McConnell AFB, Kansas
349th Air Refueling Squadron
350th Air Refueling Squadron
92d Air Refueling Wing – Fairchild AFB, Washington
92d Air Refueling Squadron
93d Air Refueling Squadron
97th Air Refueling Squadron
384th Air Refueling Squadron
912th Air Refueling Squadron – March ARB, California (Associate with 452d ARW)
375th Air Mobility Wing – Scott AFB, Illinois
906th Air Refueling Squadron (associate with 126th ARW)
18th Wing – Kadena AB, Japan
909th Air Refueling Squadron
100th Air Refueling Wing – RAF Mildenhall, England, UK
351st Air Refueling Squadron
Air Force Reserve
434th Air Refueling Wing – Grissom ARB, Indiana
72d Air Refueling Squadron
74th Air Refueling Squadron
452d Air Mobility Wing – March ARB, California
336th Air Refueling Squadron
459th Air Refueling Wing – Andrews AFB, Maryland
756th Air Refueling Squadron
507th Air Refueling Wing – Tinker AFB, Oklahoma
465th Air Refueling Squadron
730th Air Mobility Training Squadron (Altus AFB, Oklahoma)
914th Air Refueling Wing - Niagara Falls International Airport, New York
328th Air Refueling Squadron
927th Air Refueling Wing – MacDill AFB, Florida (Associate with 6th AMW)
63d Air Refueling Squadron
931st Air Refueling Group – McConnell AFB, Kansas (Associate with 22d ARW)
18th Air Refueling Squadron
940th Air Refueling Wing – Beale AFB, California
314th Air Refueling Squadron
Air National Guard
101st Air Refueling Wing – Bangor, Maine
132d Air Refueilng Squadron
108th Wing  – McGuire AFB, New Jersey
141st Air Refueling Squadron
117th Air Refueling Wing – Birmingham, Alabama
106th Air Refueling Squadron
121st Air Refueling Wing  – Rickenbacker ANGB, Ohio
166th Air Refueling Squadron
126th Air Refueling Wing – Scott AFB, Illinois
108th Air Refueling Squadron
127th Wing – Selfridge ANGB, Michigan
171st Air Refueling Squadron
128th Air Refueling Wing – Milwaukee, Wisconsin
126th Air Refueling Squadron
134th Air Refueling Wing – Knoxville, Tennessee
151st Air Refueling Squadron
141st Air Refueling Wing – Fairchild AFB, Washington (Associate with 92d ARW)
116th Air Refueling Squadron
151st Air Refueling Wing – Salt Lake City, Utah
191st Air Refueling Squadron
154th Wing – Hickam AFB, Hawaii
203d Air Refueling Squadron
155th Air Refueling Wing – Lincoln, Nebraska
173rd Air Refueling Squadron
161st Air Refueling Wing – Phoenix Sky Harbor International Airport / Goldwater Air National Guard Base, Arizona
197th Air Refueling Squadron
168th Air Refueling Wing – Eielson AFB, Alaska
168th Air Refueling Squadron
171st Air Refueling Wing – Pittsburgh IAP Air Reserve Station, Pennsylvania
146th Air Refueling Squadron
147th Air Refueling Squadron
185th Air Refueling Wing  – Sioux City, Iowa
174th Air Refueling Squadron
186th Air Refueling Wing – Meridian, Mississippi
153d Air Refueling Squadron
190th Air Refueling Wing – Topeka, Kansas
117th Air Refueling Squadron
Meta Aerospace operates 4 KC-135Rs. These aircraft were purchased from the Republic of Singapore Air Force when the latter retired them in 2019. They were delivered in late 2020.Note Italy has been reported in some sources as operating several KC-135s, however these are Boeing 707-300s converted to tanker configuration.
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