Senior Airmen Morgan Bush, left, and Vincent Franklin, right, 28th Maintenance Squadron B-1B Lancer electrical and environmental systems journeymen, show students from Douglas High School a liquid oxygen cart at Ellsworth Air Force Base, South Dakota, Dec. 12, 2023. Liquid oxygen carts store and transfer breathable air to the B-1B Lancer. (U.S. Air Force photo by Airman 1st Class Dylan Maher)