If the Chinese do succeed in creating a "carrierkiller" version of the DF-21, the U. s. Navy can modify its Aegis anti-missile system to protect carriers against such attacks.
The Navy wants a follow-on killer drone to start populating carrier decks before 2018.
海军想要一个后续无人攻击机在2018年前进行装备。
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Most important, China has reached initial operating capability on a "carrier-killer" missile - a cost-effective way of deterring carriers that cost billions to build.