160216-N-WT427-099 BUSAN, Republic of Korea (Feb. 16, 2016) Cmdr. Gary Montalvo, commanding officer of Virginia-class submarine USS North Carolina (SSN-777) is greeted during USS North Carolina's port visit to the Republic of Korea. USS North Carolina is the fourth submarine of the Virginia-class; the first class designated and built post-Cold War in order to meet the challenges of the 21st century, and has improved stealth; sophisticated surveillance capabilities, and special warfare enhancements that enable it to meet the Navy's multi-mission requirements. (U.S. Navy Photo by Mass Communication Specialist 3rd Class Jermaine M. Ralliford/Released)