According to lasdontrailofhonor.com:

As you head back onto the trail, you will approach the Korean Memorial. This memorial is the largest in the park, and was built shortly after the Vietnam Veterans Memorial. It was erected with the intention of giving special recognition to veterans of Korea, a war that some feel has been overlooked by the American people. The monument is a massive black obelisk inscribed with the names of all the servicemen from Westchester County who died serving in Korea. The monument is a grand reminder of the sacrifice made by the servicemen during this time, and the size is only a minor representation of the enormous dedication that the servicemen possessed. Its presence will certainly never be forgotten or overlooked on the trail, being 10 feet tall and standing as the largest monument in the park.