U.S. Navy Petty Officer 2nd Class Melanie Keller left, and Gunner's Mate 1st Class Cheryl Rainy pull out a sonobuoy aboard the USS Porter in the Black Sea, Oct. 7, 2015. The Porter is on a routine patrol conducting naval operations in the U.S. 6th Fleet area of responsibility to support U.S. national security interests in Europe. Keller is a sonar technician; Rainy is a gunner’s mate. U.S. Navy photo by Petty Officer 1st Class Sean Spratt