160417-N-DN943-471 FORT KNOX, Ky. (April 17, 2016) Sailors assigned to Coastal Riverine Squadron Four (CRS-4) fire crew serve weapons during a nighttime live fire exercise while conducting annual training. The coastal riverine force is a core Navy capability that provides port and harbor security, high value asset protection, and maritime security operations in coastal and inland waterways. (U.S. Navy Combat Camera photo by Mass Communication Specialist 2nd Class Gabriel Bevan/Released)