The REMUS MK 18 unmanned underwater vehicle sits mounted on a support system made of wood and fiberglass composites in the Fanselau Coil Facility at Naval Support Activity Panama City in Panama City, Florida July 12, 2016. The complex is designed to simulate Earth’s inconsistent magnetic fields, which enables scientists to measure magnetic effects on UUVs and characterize foreign sensors over a vast area. DoD photo by EJ Hersom