171103-N-FP878-007 MEDITERRANEAN SEA (Nov. 3, 2017) Mary Larson, a Navy College Program for Afloat College Education professor, teaches an algebra class aboard the Arleigh Burke-class guided-missile destroyer USS Donald Cook (DDG 75). Donald Cook is on patrol in the U.S. 6th Fleet area of operations in support of regional allies and partners, and U.S. national security interests in Europe. (U.S. Navy photo by Mass Communication Specialist 1st Class Theron J. Godbold /Released)