I'm surprised noone's pointed out the obvious - the US have obligations under stategic nuclear arms reduction treaties such as START I that compel the US to chop up B-52s, put the parts in the desert, and leave them there long enough to allow the Russians time to use satellite imagery to confirm they've been chopped up.
"365 B-52Gs were flown to the Aerospace Maintenance and Regeneration Center at Davis-Monthan Air Force Base in Arizona. The bombers were stripped of all usable parts, then chopped into five pieces by a 13,000-pound steel blade dropped from a crane. The guillotine sliced four times on each plane, severing the wings and leaving the fuselage in three pieces. The ruined B-52s remained in place for three months so that Russian satellites could confirm that the bombers had been destroyed, after which they were sold for scrap."
https://secure.wikimedia.org/wikipedia/en/wiki/START_I
"365 B-52Gs were flown to the Aerospace Maintenance and Regeneration Center at Davis-Monthan Air Force Base in Arizona. The bombers were stripped of all usable parts, then chopped into five pieces by a 13,000-pound steel blade dropped from a crane. The guillotine sliced four times on each plane, severing the wings and leaving the fuselage in three pieces. The ruined B-52s remained in place for three months so that Russian satellites could confirm that the bombers had been destroyed, after which they were sold for scrap."