A large, grey military aircraft, identified as a Boeing KC-135 Stratotanker, slowly taxis on an asphalt taxiway at an airport. The four-engine aircraft is seen moving from the right side of the frame towards the left. It features a long fuselage and a T-tail, with a discernible U.S. military star-and-bar insignia visible on the tail fin. The scene is set outdoors on a bright, clear day, with a blue sky dotted with scattered white clouds. In the foreground, green grassy slopes with patches of yellow wildflowers create a natural divider, separated from the airport by a chain-link fence. In the mid-ground, behind the taxiing aircraft, a red-and-white striped airport building is visible. A small white ground support vehicle is near the aircraft's left wing. Majestic mountains form a picturesque backdrop in the far distance, hinting at the location's topography, consistent with the provided context of Sofia, Bulgaria.