The "massive ordnance penetrator," or MOP bomb, will be the largest conventional bomb in the U.S. arsenal. It is now undergoing testing and is slated to come on line by mid-2010.
The bomb, made by Boeing Co., is approximately 20.5 feet long. It has a 31.5-inch diameter and weighs slightly less than 30,000 pounds.
The weapon will carry more than 5,300 pounds of explosive material and will deliver more than 10 times the explosive power of its predecessor, the BLU-109. Guided by global positioning system navigation, the MOP will be carried aboard Air Force B-2 bombers.