Air Force Chief of Staff Gen. David L. Goldfein gives remarks during the Special Tactics Ruck March Memorial Ceremony at Hurlburt Field, Florida, March 4, 2018. Twenty Special Tactics Airmen rucked from Medina Annex at Lackland Air Force Base, Texas to Hurlburt Field, to pay tribute to Staff Sgt. Dylan J. Elchin who was killed in Afghanistan on Nov. 27, 2018, and in honor of the other 19 Special Tactics Airmen who have been killed in action since 9/11. (U.S. Air Force photo by Senior Airman Joseph Pick)