Defense Threat Reduction Agency test personnel prepare to carefully offload the 30,000-pound massive ordnance penetrator, or MOP, for a static test at White Sands Missile Range, N.M. (DTRA photo) Battle damage assessment from Iran strikes could lead to improvements in MOP bomb technology A senior defense official discussed the Massive Ordnance Penetrator weapon during a briefing with reporters Thursday. 1 day ago By Jon Harper