Sioux Falls, SD (KELO-AM) Flag Day was marked in Sioux Falls with a special program honoring American Veterans and those still serving at Vet's Memorial Park Sunday morning. South Dakota Governor Dennis Daugaard delivered the keynote address, while World War II aircraft zoomed overhead. The aircraft were on display Sunday afternoon at Joe Foss Field's Maverick Air Center, as part of the Commemorative Air Force "Honor Flight Reunion" also honoring veterans from WWII.