170201-N-HD510-0016 BUTTLERVILLE, Ind. (Jan. 23, 2017) East coast-based Navy SEALs in a High Mobility Multipurpose Wheeled Vehicle blow through a simulated chemical attack during Special Operations Urban Combat training in Buttlerville, Ind. SEALs are practicing skills during work ups they will need during deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Scott Fenaroli/Released)