Shoulders of giants: AFDW command chief speaks at Air Force Retirement Home Published Sept. 16, 2019 By Master Sgt. Michael B. Keller Air Force District of Washington Public Affairs WASHINGTON -- Chief Master Sgt. Christopher M. Yevchak, Air Force District of Washington command chief, speaks during the 72nd Air Force birthday event at the Armed Forces Retirement Home in Washington D.C., Sept. 13, 2019. (U.S. Air Force photo by Master Sgt. Michael B. Keller)