U.S. Air Force Lt. Col. William Fish, 11th Bomb Squadron commander, introduces the guest speaker of the B-52 Stratofortress Formal Training Unit Class 17-03 graduation ceremony, Chief Master Sgt. Thomas Mazzone, the command chief master sergeant of Air Force Global Strike Command, on Barksdale Air Force Base, Louisiana, May 18, 2018. Mazzone stressed the importance of being a good Airman on and off the B-52 to the graduates. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)