Participating U.S. forces included the Arleigh-Burke-class guided-missile destroyer USS William P. Lawrence and a maritime patrol aircraft, according to South Korean naval officials. South Korea contributed roughly 10 aircraft and 10 warships, including the destroyer ROKS Yulgok Yi I.

A reassessment by U.S. regarding North Korea's military capabilities marks a shift in understanding the country's defensive posture.

The top military officers of South Korea and the US vowed to further strengthen the allies' trilateral security cooperation with Japan during their first video talks earlier this week, the

The latest United States ... North Korea's founding day in Pyongyang, North Korea, on September 9, 2018. Ng Han Guan/AP Photo U.S. forces have remained in South Korea with more than 28,500 ...