With the advent of drone warfare, many traditional bombers have become redundant.

redundant 是形容词，来自动词 redund（过剩、过多），加上后缀 -ant 构成形容词，意思是"多余的、过剩的"。在军事语境中，指因技术进步而被淘汰或不再需要的武器装备。