B-58 range

A 1968 letter from Defense Secretary Clifford to State Secretary Rusk at http://www.state.gov/r/pa/ho/frus/johnsonlb/xii/2262.htm mentioned that the air bases in Spain were originally built for SAC operations and some B-58 bombers and accompanying tankers were earmarked for forward deployment there.

Here is my quesion – how many refuels were needed for a fully-laden B-58 to bomb its target in the USSR and come back to Spain?

On a side note, Vice Admiral Gerald E. Miller wrote in his book “Nuclear Weapons and Aircraft Carriers” that the Navy RA-5C Vigilantes – operating from carriers in the Bay of Biscay – were assigned to targets in Eastern Europe.

Cheers,
Sunho