The 21st Theater Sustainment Command engineers from 1st Platoon, 541st Sapper Company, 54th Engineer Battalion, 18th Engineer Brigade, and Spanish army engineers scan the road for improvised explosive devices in front of a route clearance patrol during a joint training exercise, Oct. 29. The exercise known as Interdict 12, hosted by the Spanish Engineer Command, was to foster and enhance the interoperability among engineer units towards counter IED operations.