The three were transported from United States Fleet Activities Sasebo on HMS Charity, to a 1 September 1950 rendezvous with ROK Commander Lee Sung Ho's PC-703, southwest of Tokchok-do (Deokjeok Island).

Upon landing on Tokchok-do, they quickly learned Yonghung-do (Yeongheung Island) was only occupied by five North Korean troops, with a battalion on Taebu-do.

Lee assigned LTJG Paik and ten sailors to help Clark and his men capture Yonghung-do, which they did in short order.

Clark and his men then moved to Palmi-do, where they lit the light at 00:50 on the 15th, guiding the invasion fleet proceeding up Flying Fish Channel.

Clark was awarded the Silver Star by the Navy for "conspicuous gallantry and intrepidity" in obtaining "vital intelligence information".

"[2]: 323–324 Later, in advance of the United Nations Forces making their way to the Yalu River, Clark, Youn Joung, and 150 South Korean guerrillas went island hopping up the west coast of North Korea.

[2]: 324 In his last mission in early 1951, Clark escorted Brigadier General Crawford Sams, one of the Army's top doctors, into enemy-held Wonsan to investigate a reported outbreak of bubonic plague.

They also had a Department of Defense clearance to publish The Secrets of Inchon: The Untold Story of the Most Daring Covert Mission of the Korean War.