The Wind Corrected Munitions Dispenser (WCMD) is a modification kit to equip submunition dispensers of the Tactical Munitions Despenser (TMD) family with a guidance system. The baseline WCMD incorporates an inertial navigation system (INS), and has flip-out control fins to steer the bomb. Additional GPS guidance was considered unnecessary, because the delivery aircraft are equipped with a GPS system. The latter is used to update the WCMD's INS immediately before release, and the resulting accuracy is good enough for cluster bombs. The WCMD guidance kit can replace the tail of any TMD-based cluster bomb.
The WCMD-ER is the extended range version of the WCMD guidance kit. It adds a wing kit to increase stand-off range to 40-65 kilometers (30-40 miles), as well as additional GPS guidance to maintain WCMD's accuracy.