With tensions between Washington and Tehran soaring, the US Air Force has moved to restock its GBU-57 Massive Ordnance Penetrator (MOP) bunker-buster bombs, which is the same weapons used in June during Operation Midnight Hammer, when several - some reports say over a dozen - were dropped on three Iranian nuclear facilities.

Along with the ongoing US military build-up in the US Central Command (CENTCOM) region of responsibility, this is another big sign that Trump-ordered military action could be imminent, despite that the Iranians have not attacked the United States or its bases abroad. On that, the below is where things stand in terms of deployments...

A partially redacted federal notice posted last week confirms the Air Force awarded Boeing a sole-source contract to replenish the depleted stockpile.

The Air Force stated the move was necessary because "this procurement and sustainment activity is critically needed to replenish the inventory of GBU-57’s, ended during Operation Midnight Hammer (21 June 25)."

The notice further explains the Pentagon bypassed a competitive bidding process because Boeing has "uniquely acquired expertise over a period of 18 years of adapting this specialized weapon to meet evolving mission needs as MOP transitioned from proof-of-concept to Full Operational Capability." Also, any alternate decision might have resulted in delays.

Boeing is the only manufacturer of the 30,000-pound GBU-57 MOP, the deep-penetration bomb designed to destroy hardened underground targets.

"No delay in award is acceptable for this effort. Delaying this requirement would undermine force readiness and efficient acquisitions for this key weapons program. A delay undermines Combatant Commanders’ capabilities, jeopardizes force readiness and strategic deterrence, hinders nuclear proliferation prevention efforts, and could result in loss of life," the notice stated.

That is one big bomb...

One remaining key detail from the June war which has been shrouded in contradiction and ambiguity is whether the initial bunker busters really obliterated Iran's nuclear development capability. President Trump certainly claimed this several times soon after the fact, and yet now warns the Iranians against moving forward with their nuclear program.