Master Sgt. Devin Kay, 344th Air Refueling Squadron instructor boom operator, follows a checklist after take-off from McConnell Air Force Base, Kan., Feb. 28, 2019. Kay is in charge of teaching how to operate the new refueling system to the 344th boom operators. The 3-D glasses are part of the new capabilities of the new aircraft the Air Force accepted Jan. 25, 2019. (U.S. Air Force photo by Staff. Sgt. David Bernal Del Agua)