How may time does diplomacy have to fail before you react? Your article is either disinformation of just plan fabrication. For one thing the US would not subcontract movement of such munitions leading up to a possible operation against Iran; it?s just to obvious . Plus they are probably already pre-positioned somewhere in the Middle East. The Iran contingency has been planned since 1979 and just gets updated to reflect weapons advancement. Good try!
Aden hotel used by Yemen goverment hit by grenade (Reuters)
from the article: Report: U.S. positioning 'bunker-busters' for possible Iran strike