The Mobile Service Tower has begun to retract from the #AtlasV. An undercarriage transport system is rolling on rail tracks to move the 260-foot-tall, 11-million-pound (79-meter; 5-million-kg) gantry away from the rocket. https://t.co/W859rlSMf3 pic.twitter.com/lpk1TJPzoD

— ULA (@ulalaunch) September 27, 2021