Sentence:  I am recommending additional acquisitions of the improved version of the B-52 ( the B-52 H with the new turbofan engine ) and procurement of the B-58 <WSD>supersonic</WSD> medium bomber , together with the supporting refueling tankers in each case . 
Meaning of the word marked with <WSD> tags:  (of speed) greater than the speed of sound in a given medium (especially air)