McAlester Army Ammunition Plant is being expanded to increase the production capacity of the GBU-57A/B Massive Ordnance Penetrator (MOP).
Right now there is facilitation for just 2 of the massive bombs per month. The new assembly area will open sometime in the next 5 months and will allow for production of at least 6 and possibly 8 MOPs per month. It will also support production of 2000 & 5000 pound bombs.
MOPs are only integrated on the US Air Force's B-2 Spirit stealth bombers, and are essential to contingency plans for striking Iran or North Korea's hardened WMD & ballistic missile facilities.