参加阅兵的鸽子，还有一只没回来

Core Viewpoint - The article highlights the dedication and preparation involved in training racing pigeons for significant events, showcasing the commitment of pigeon owners like Li He in Beijing, who has been involved in this activity for thirty years [1] Group 1: Pigeon Training and Events - Li He, a pigeon owner in Beijing, has been raising pigeons for thirty years and has participated in important events such as the 9.3 military parade and the centenary celebration of the Communist Party [1] - This year, 30 pigeons were selected for a mission, with 29 successfully returning, while one named "Dabai" has not yet returned, drawing attention from netizens [1] - The pigeon association began rigorous health screenings and vaccination protocols four months prior to the event to ensure the pigeons were in optimal flying condition [1]