B-2 US

Tankers

KC-10 US Boom
KC-135 Turkey Boom
KC-135 US Boom
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Planning Data. ATP-56(b) Annex ZE

KC-10
Buddy Cruise IAS/MACH 0.76
Optimum AAR ALT/CAS/MACH 25,000/320/0.70

KC-135 (FWD limit is 10, AFT limit is 18. Extend boom to 12 feet for precontact)
Buddy Cruise IAS/MACH 0.76
Optimum AAR ALT/CAS/MACH 25,000/the lower of 2600/0.75

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More information in:
http://www.fas.org/nuke/guide/usa/bomber/b-2.htm
http://www.af.mil/photos/index.asp?galleryID=14