U.S. Marines and Sailors give a safety brief to Katherine Zimmerman, resident fellow at the American Enterprise Institute, Yemen and Africa subject matter expert, before she departs the amphibious assault ship USS Bataan (LHD 5) in the Atlantic Ocean Dec. 19, 2019. The Bataan is operating in the Atlantic Ocean in support of naval operations to maintain maritime stability and security in order to ensure access, deter aggression and defend U.S., allied and partner interests.